CYPRESS CY7C63722C User Manual

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CY7C63722C CY7C63723C CY7C63743C

enCoRe™ USB Combination Low-Speed

USB and PS/2 Peripheral Controller

1.0 Features

• enCoRe™ USB - enhanced Component Reduction — Internal oscillator eliminates the need for an external

crystal or resonator

— Interface can auto-configure to operate as PS/2 or

USB without the need for external components to switch between modes (no General Purpose I/O

[GPIO] pins needed to manage dual mode capability) — Internal 3.3V regulator for USB pull-up resistor — Configurable GPIO for real-world interface without

external components

• Flexible, cost-effective solution for applications that combine PS/2 and low-speed USB, such as mice, gamepads, joysticks, and many others.

• USB Specification Compliance

— Conforms to USB Specification, Version 2.0 — Conforms to USB HID Specification, Version 1.1 — Supports one low-speed USB device address and

three data endpoints — Integrated USB transceiver — 3.3V regulated output for USB pull-up resistor

• 8-bit RISC microcontroller — Harvard architecture

— 6-MHz external ceramic resonator or internal clock

mode — 12-MHz internal CPU clock — Internal memory — 256 bytes of RAM — 8 Kbytes of EPROM — Interface can auto-configure to operate as PS/2 or

USB — No external components for switching between PS/2

and USB modes — No GPIO pins needed to manage dual mode

capability

• I/O ports

— Up to 16 versatile GPIO pins, individually

configurable

— High current drive on any GPIO pin: 50 mA/pin

current sink

— Each GPIO pin supports high-impedance inputs,

internal pull-ups, open drain outputs or traditional CMOS outputs

— Maskable interrupts on all I/O pins

• SPI serial communication block — Master or slave operation

— 2 Mbit/s transfers

• Four 8-bit Input Capture registers — Two registers each for two input pins

— Capture timer setting with five prescaler settings — Separate registers for rising and falling edge capture — Simplifies interface to RF inputs for wireless

applications

• Internal low-power wake-up timer during suspend

mode

— Periodic wake-up with no external components

• Optional 6-MHz internal oscillator mode — Allows fast start-up from suspend mode

• Watchdog Reset (WDR)

• Low-voltage Reset at 3.75V

• Internal brown-out reset for suspend mode

• Improved output drivers to reduce EMI

• Operating voltage from 4.0V to 5.5VDC

• Operating temperature from 0°C to 70°C

• CY7C63723C available in 18-pin SOIC, 18-pin PDIP

• CY7C63743C available in 24-pin SOIC, 24-pin PDIP,

24-pin QSOP

• CY7C63722C available in DIE form

• Industry standard programmer support

Cypress Semiconductor Corporation • 198 Champion Court • San Jose • CA 95134 • 408-943-2600

Document #: 38-08022 Rev. *C Revised February 25, 2006

2.0 Logic Block Diagram

FOR

CY7C63722C CY7C63723C CY7C63743C

XTALOUT XTALIN/P2.1

Internal

Oscillator

EPROM

8K Byte

Brown-out

Reset

Xtal

Oscillator

8-bit

RISC

Core

Wake-Up

Timer

Interrupt

Controller

Watch

Dog

Timer

Low

Voltage

Reset

3.3V

Regulator

VREG/P2.0

3.0 Functional Overview

3.1 enCoRe USB—The New USB Standard

Cypress has reinvented its leadership position in the low-speed USB market with a new family of innovative microcontrollers. Introducing...enCoRe USB—“enhanced Component Reduction.” Cypress has leveraged its design expertise in USB solutions to create a new family of low-speed USB microcontrollers that enables peripheral developers to design new products with a minimum number of components. At the heart of the enCoRe USB technology is the breakthrough design of a crystalless oscillator. By integrating the oscillator into our chip, an external crystal or resonator is no longer needed. We have also integrated other external components commonly found in low-speed USB applications such as pull-up resistors, wake-up circuitry, and a 3.3V regulator. All of this adds up to a lower system cost.

The CY7C637xxC is an 8-bit RISC one-time-programmable (OTP) microcontroller. The instruction set has been optimized specifically for USB and PS/2 operations, although the microcontrollers can be used for a variety of other embedded applications.

The CY7C637xxC features up to 16 GPIO pins to support USB, PS/2 and other applications. The I/O pins are grouped into two ports (Port 0 to 1) where each pin can be individually configured as inputs with internal pull-ups, open drain outputs, or traditional CMOS outputs with programmable drive strength of up to 50 mA output drive. Additionally, each I/O pin can be used to generate a GPIO interrupt to the microcontroller. Note the GPIO interrupts all share the same “GPIO” interrupt vector.

The CY7C637xxC microcontrollers feature an internal oscillator. With the presence of USB traffic, the internal oscillator can be set to precisely tune to USB timing requirements (6

RAM

256 Byte

USB

Engine

12-bit Timer

Port 1 GPIO

Capture

Timers

Port 0 GPIO

SPI

USB &

PS/2

Xcvr

D+,D–

MHz ±1.5%). Optionally, an external 6-MHz ceramic resonator can be used to provide a higher precision reference for USB operation. This clock generator reduces the clock-related noise emissions (EMI). The clock generator provides the 6and 12-MHz clocks that remain internal to the microcontroller.

The CY7C637xxC has 8 Kbytes of EPROM and 256 bytes of data RAM for stack space, user variables, and USB FIFOs.

These parts include low-voltage reset logic, a Watchdog timer, a vectored interrupt controller, a 12-bit free-running timer, and capture timers. The low-voltage reset (LVR) logic detects when power is applied to the device, resets the logic to a known state, and begins executing instructions at EPROM address 0x0000. LVR will also reset the part when V below the operating voltage range. The Watchdog timer can be used to ensure the firmware never gets stalled for more than approximately 8 ms.

The microcontroller supports 10 maskable interrupts in the vectored interrupt controller. Interrupt sources include the USB Bus-Reset, the 128-µs and 1.024-ms outputs from the free-running timer, three USB endpoints, two capture timers, an internal wake-up timer and the GPIO ports. The timers bits cause periodic interrupts when enabled. The USB endpoints interrupt after USB transactions complete on the bus. The capture timers interrupt whenever a new timer value is saved due to a selected GPIO edge event. The GPIO ports have a level of masking to select which GPIO inputs can cause a GPIO interrupt. For additional flexibility, the input transition polarity that causes an interrupt is programmable for each GPIO pin. The interrupt polarity can be either rising or falling edge.

The free-running 12-bit timer clocked at 1 MHz provides two interrupt sources as noted above (128 µs and 1.024 ms). The timer can be used to measure the duration of an event under firmware control by reading the timer at the start and end of an

P1.0–P1.7

P0.0–P0.7

drops

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event, and subtracting the two values. The four capture timers save a programmable 8 bit range of the free-running timer when a GPIO edge occurs on the two capture pins (P0.0, P0.1).

The CY7C637xxC includes an integrated USB serial interface engine (SIE) that supports the integrated peripherals. The hardware supports one USB device address with three endpoints. The SIE allows the USB host to communicate with the function integrated into the microcontroller. A 3.3V

The USB D+ and D– USB pins can alternately be used as PS/2 SCLK and SDATA signals, so that products can be designed to respond to either USB or PS/2 modes of operation. PS/2 operation is supported with internal pull-up resistors on SCLK and SDATA, the ability to disable the regulator output pin, and an interrupt to signal the start of PS/2 activity. No external components are necessary for dual USB and PS/2 systems, and no GPIO pins need to be dedicated to switching between modes. Slow edge rates operate in both modes to reduce EMI.

regulated output pin provides a pull-up source for the external USB resistor on the D– pin.

4.0 Pin Configurations

Top View

CY7C63723C

18-pin SOIC/PDIP

P0.0

P0.1

P0.2

P0.3

P1.0

5 6

VSS

VPP

VREG/P2.0

XTALIN/P2.1

8 9

18 17 16 15 14 13 12 11 10

P0.4 P0.5

P0.6 P0.7 P1.1

D+/SCLK D–/SDATA VCC XTALOUT

CY7C63743C

24-pin SOIC/PDIP/QSOP

P0.0

1 P0.1 P0.2 P0.3 P1.0 P1.2 P1.4 P1.6 VSS VPP

VREG/P2.0

XTALIN/P2.1

24 23

P0.4 P0.5

P0.6 P0.7

P1.1 P1.3 P1.5 P1.7 D+/SCLK D–/SDATA VCC XTALOUT

CY7C63722C-XC

DIE

1 P0.0

3 P0.2

2 P0.1

P0.3 P1.0 P1.2 P1.4 P1.6 VSS

VSS

25 P0.4

4 5 6

8 9

111213

VPP

VREG

XTALIN/P2.1

24 P0.5

23 P0.6

P0.7

P1.1

P1.3

P1.5

P1.7

D+/SCLK

VCC

D-/SDATA

XTALOUT

5.0 Pin Definitions

CY7C63723C CY7C63743C CY7C63722C

Name I/O

D–/SDATA, D+/SCLK

P0[7:0] I/O 1, 2, 3, 4,

I/O 12

15, 16, 17, 18

15 16

1, 2, 3, 4,

21, 22, 23, 24

16 17

1, 2, 3, 4,

22, 23, 24, 25

USB differential data lines (D– and D+), or PS/2 clock and data signals (SDATA and SCLK)

GPIO Port 0 capable of sinking up to 50 mA/pin, or sinking controlled low or high programmable current. Can also source 2 mA current, provide a resistive pull-up, or serve as a high-impedance input. P0.0 and P0.1 provide inputs to Capture Timers A and B, respectively.

P1[7:0] I/O 5, 14 5, 6, 7, 8,

17, 18, 19, 20

5, 6, 7, 8,

18, 19, 20, 21

IO Port 1 capable of sinking up to 50 mA/pin, or sinking controlled low or high programmable current. Can also source 2 mA current, provide a resistive pull-up, or serve as a high-impedance input.

XTALIN/P2.1 IN 9 12 13 6-MHz ceramic resonator or external clock input, or

P2.1 input

XTALOUT OUT 10 13 14 6-MHz ceramic resonator return pin or internal oscillator

output

7 10 11 Programming voltage supply, ground for normal

operation

11 14 15 Voltage supply

VREG/P2.0 8 11 12 Voltage supply for 1.3-kΩ USB pull-up resistor (3.3V

nominal). Also serves as P2.0 input.

6 9 9, 10 Ground

Description18-Pin 24-Pin 25-Pad

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6.0 Programming Model

Refer to the CYASM Assembler User’s Guide for more details on firmware operation with the CY7C637xxC microcontrollers.

6.1 Program Counter (PC)

The 14-bit program counter (PC) allows access for up to 8 Kbytes of EPROM using the CY7C637xxC architecture. The program counter is cleared during reset, such that the first instruction executed after a reset is at address 0x0000. This instruction is typically a jump instruction to a reset handler that initializes the application.

The lower 8 bits of the program counter are incremented as instructions are loaded and executed. The upper six bits of the program counter are incremented by executing an XPAGE instruction. As a result, the last instruction executed within a 256-byte “page” of sequential code should be an XPAGE instruction. The assembler directive “XPAGEON” will cause the assembler to insert XPAGE instructions automatically. As instructions can be either one or two bytes long, the assembler may occasionally need to insert a NOP followed by an XPAGE for correct execution.

The program counter of the next instruction to be executed, carry flag, and zero flag are saved as two bytes on the program stack during an interrupt acknowledge or a CALL instruction. The program counter, carry flag, and zero flag are restored from the program stack only during a RETI instruction.

Please note the program counter cannot be accessed directly by the firmware. The program stack can be examined by reading SRAM from location 0x00 and up.

6.2 8-bit Accumulator (A)

The accumulator is the general-purpose, do everything register in the architecture where results are usually calculated.

6.3 8-bit Index Register (X)

The index register “X” is available to the firmware as an auxiliary accumulator. The X register also allows the processor to perform indexed operations by loading an index value into X.

The return from interrupt (RETI) instruction decrements the program stack pointer, then restores the second byte from memory addressed by the PSP. The program stack pointer is decremented again and the first byte is restored from memory addressed by the PSP. After the program counter and flags have been restored from stack, the interrupts are enabled. The effect is to restore the program counter and flags from the program stack, decrement the program stack pointer by two, and reenable interrupts.

The call subroutine (CALL) instruction stores the program counter and flags on the program stack and increments the PSP by two.

The return from subroutine (RET) instruction restores the program counter, but not the flags, from program stack and decrements the PSP by two.

Note that there are restrictions in using the JMP, CALL, and INDEX instructions across the 4-KByte boundary of the program memory. Refer to the CYASM Assembler User’s Guide for a detailed description.

6.5 8-bit Data Stack Pointer (DSP)

The data stack pointer (DSP) supports PUSH and POP instructions that use the data stack for temporary storage. A PUSH instruction will pre-decrement the DSP, then write data to the memory location addressed by the DSP. A POP instruction will read data from the memory location addressed by the DSP, then post-increment the DSP.

During a reset, the Data Stack Pointer will be set to zero. A PUSH instruction when DSP equals zero will write data at the top of the data RAM (address 0xFF). This would write data to the memory area reserved for a FIFO for USB endpoint 0. In non-USB applications, this works fine and is not a problem.

For USB applications, the firmware should set the DSP to an appropriate location to avoid a memory conflict with RAM dedicated to USB FIFOs. The memory requirements for the USB endpoints are shown in Section 8.2. For example, assembly instructions to set the DSP to 20h (giving 32 bytes for program and data stack combined) are shown below.

MOV A,20h ; Move 20 hex into Accumulator (must be D8h or less to avoid USB FIFOs)

SWAP A,DSP ; swap accumulator value into DSP register

6.4 8-bit Program Stack Pointer (PSP)

During a reset, the program stack pointer (PSP) is set to zero. This means the program “stack” starts at RAM address 0x00 and “grows” upward from there. Note that the program stack pointer is directly addressable under firmware control, using the MOV PSP,A instruction. The PSP supports interrupt service under hardware control and CALL, RET, and RETI instructions under firmware control.

During an interrupt acknowledge, interrupts are disabled and the program counter, carry flag, and zero flag are written as two bytes of data memory. The first byte is stored in the memory addressed by the program stack pointer, then the PSP is incremented. The second byte is stored in memory addressed by the program stack pointer and the PSP is incremented again. The net effect is to store the program counter and flags on the program “stack” and increment the program stack pointer by two.

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6.6 Address Modes

The CY7C637xxC microcontrollers support three addressing modes for instructions that require data operands: data, direct, and indexed.

6.6.1 Data

The “Data” address mode refers to a data operand that is actually a constant encoded in the instruction. As an example, consider the instruction that loads A with the constant 0x30:

• MOV A, 30h

This instruction will require two bytes of code where the first byte identifies the “MOV A” instruction with a data operand as the second byte. The second byte of the instruction will be the constant “0xE8h”. A constant may be referred to by name if a prior “EQU” statement assigns the constant value to the name. For example, the following code is equivalent to the example shown above.

FOR

CY7C63722C CY7C63723C CY7C63743C

• DSPINIT: EQU 30h

• MOV A,DSPINIT

6.6.2 Direct

“Direct” address mode is used when the data operand is a variable stored in SRAM. In that case, the one byte address of the variable is encoded in the instruction. As an example, consider an instruction that loads A with the contents of memory address location 0x10h:

• MOV A, [10h]

In normal usage, variable names are assigned to variable addresses using “EQU” statements to improve the readability of the assembler source code. As an example, the following code is equivalent to the example shown above.

• buttons: EQU 10h

• MOV A, [buttons]

6.6.3 Indexed

“Indexed” address mode allows the firmware to manipulate arrays of data stored in SRAM. The address of the data operand is the sum of a constant encoded in the instruction and the contents of the “X” register. In normal usage, the constant will be the “base” address of an array of data and the X register will contain an index that indicates which element of the array is actually addressed.

• array: EQU 10h

•MOV X,3

• MOV A, [x+array]

This would have the effect of loading A with the fourth element of the SRAM “array” that begins at address 0x10h. The fourth element would be at address 0x13h.

7.0 Instruction Set Summary

Refer to the CYASM Assembler User’s Guide for detailed information on these instructions. Note that conditional jump instructions (i.e., JC, JNC, JZ, JNZ) take five cycles if jump is taken, four cycles if no jump.

MNEMONIC Operand Opcode Cycles MNEMONIC Operand Opcode Cycles

HALT 00 7

ADD A,expr data 01 4

ADD A,[expr] direct 02 6 INC X x 22 4

ADD A,[X+expr] index 03 7

ADC A,expr data 04 4

ADC A,[expr] direct 05 6 DEC A acc 25 4

ADC A,[X+expr] index 06 7

SUB A,expr data 07 4

SUB A,[expr] direct 08 6 DEC [X+expr] index 28 8

SUB A,[X+expr] index 09 7

SBB A,expr data 0A 4

SBB A,[expr] direct 0B 6

SBB A,[X+expr] index 0C 7

OR A,expr data 0D 4

OR A,[expr] direct 0E 6

OR A,[X+expr] index 0F 7

AND A,expr data 10 4

AND A,[expr] direct 11 6

AND A,[X+expr] index 12 7

XOR A,expr data 13 4

XOR A,[expr] direct 14 6

XOR A,[X+expr] index 15 7

CMP A,expr data 16 5

CMP A,[expr] direct 17 7

CMP A,[X+expr] index 18 8

MOV A,expr data 19 4

NOP 20 4

INC A acc 21 4

INC [expr] direct 23 7

INC [X+expr] index 24 8

DEC X x 26 4

DEC [expr] direct 27 7

IORD expr address 29 5

IOWR expr address 2A 5

POP A 2B 4

POP X 2C 4

PUSH A 2D 5

PUSH X 2E 5

SWAP A,X 2F 5

SWAP A,DSP 30 5

MOV [expr],A direct 31 5

MOV [X+expr],A index 32 6

OR [expr],A direct 33 7

OR [X+expr],A index 34 8

AND [expr],A direct 35 7

AND [X+expr],A index 36 8

XOR [expr],A direct 37 7

XOR [X+expr],A index 38 8

IOWX [X+expr] index 39 6

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MNEMONIC Operand Opcode Cycles

MOV A,[expr] direct 1A 5

MOV A,[X+expr] index 1B 6

MOV X,expr data 1C 4 ASR 3C 4

MOV X,[expr] direct 1D 5

reserved 1E RRC 3E 4

XPAGE 1F 4

MOV A,X 40 4

MOV X,A 41 4

MOV PSP,A 60 4 RETI 73 8

CALL addr 50 - 5F 10

JMP addr 80-8F 5

CALL addr 90-9F 10

JZ addr A0-AF 5 (or 4)

JNZ addr B0-BF 5 (or 4) INDEX addr F0-FF 14

MNEMONIC Operand Opcode Cycles

CPL 3A 4

ASL 3B 4

RLC 3D 4

RET 3F 8

DI 70 4

EI 72 4

JC addr C0-CF 5 (or 4)

JNC addr D0-DF 5 (or 4)

JACC addr E0-EF 7

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8.0 Memory Organization

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8.1 Program Memory Organization

After reset Address

14 -bit PC 0x0000 Program execution begins here after a reset

[1]

0x0002 USB Bus Reset interrupt vector

0x0004 128-µs timer interrupt vector

0x0006 1.024-ms timer interrupt vector

0x0008 USB endpoint 0 interrupt vector

0x000A USB endpoint 1 interrupt vector

0x000C USB endpoint 2 interrupt vector

0x000E SPI interrupt vector

0x0010 Capture timer A interrupt Vector

0x0012 Capture timer B interrupt vector

0x0014 GPIO interrupt vector

0x0016 Wake-up interrupt vector

0x0018 Program Memory begins here

0x1FDF 8 KB PROM ends here (8K - 32 bytes). See Note below

Figure 8-1. Program Memory Space with Interrupt Vector Table

Note:

1. The upper 32 bytes of the 8K PROM are reserved. Therefore, the user’s program must not overwrite this space.

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8.2 Data Memory Organization

The CY7C637xxC microcontrollers provide 256 bytes of data RAM. In normal usage, the SRAM is partitioned into four areas: program stack, data stack, user variables and USB endpoint FIFOs as shown below.

After reset Address

8-bit DSP 8-bit PSP 0x00 Program Stack Growth

(User’s firmware moves DSP)

8-bit DSP User Selected Data Stack Growth

User Variables

0xE8

USB FIFO for Address A endpoint 2

CY7C63722C CY7C63723C CY7C63743C

0xF0

USB FIFO for Address A endpoint 1

0xF8

USB FIFO for Address A endpoint 0

Top of RAM Memory 0xFF

Figure 8-2. Data Memory Organization

8.3 I/O Register Summary

I/O registers are accessed via the I/O Read (IORD) and I/O Write (IOWR, IOWX) instructions. IORD reads the selected port into the accumulator. IOWR writes data from the accumulator to the selected port. Indexed I/O Write (IOWX) adds the contents of X to the address in the instruction to form the port address and writes data from the accumulator to the specified

Table 8-1. I/O Register Summary

Port 0 Data 0x00 R/W GPIO Port 0 12-2

Port 1 Data 0x01 R/W GPIO Port 1 12-3

Port 2 Data 0x02 R Auxiliary input register for D+, D–, VREG, XTALIN 12-8

Port 0 Interrupt Enable 0x04 W Interrupt enable for pins in Port 0 21-4

Port 1 Interrupt Enable 0x05 W Interrupt enable for pins in Port 1 21-5

Port 0 Interrupt Polarity 0x06 W Interrupt polarity for pins in Port 0 21-6

Port 1 Interrupt Polarity 0x07 W Interrupt polarity for pins in Port 1 21-7

Port 0 Mode0 0x0A W Controls output configuration for Port 0 12-4

Port 0 Mode1 0x0B W 12-5

Port 1 Mode0 0x0C W Controls output configuration for Port 1 12-6

Port 1 Mode1 0x0D W 12-7

port. Note that specifying address 0 with IOWX (e.g., IOWX 0h) means the I/O port is selected solely by the contents of X.

Note: All bits of all registers are cleared to all zeros on reset, except the Processor Status and Control Register

(Figure 20-1). All registers not listed are reserved, and should never be written by firmware. All bits marked as reserved should always be written as 0 and be treated as undefined by reads.

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Table 8-1. I/O Register Summary (continued)

USB Device Address 0x10 R/W USB Device Address register 14-1

EP0 Counter Register 0x11 R/W USB Endpoint 0 counter register 14-4

EP0 Mode Register 0x12 R/W USB Endpoint 0 configuration register 14-2

EP1 Counter Register 0x13 R/W USB Endpoint 1 counter register 14-4

EP1 Mode Register 0x14 R/W USB Endpoint 1 configuration register 14-3

EP2 Counter Register 0x15 R/W USB Endpoint 2 counter register 14-4

EP2 Mode Register 0x16 R/W USB Endpoint 2 configuration register 14-3

USB Status & Control 0x1F R/W USB status and control register 13-1

Global Interrupt Enable 0x20 R/W Global interrupt enable register 21-1

Endpoint Interrupt Enable 0x21 R/W USB endpoint interrupt enables 21-2

Timer (LSB) 0x24 R Lower 8 bits of free-running timer (1 MHz) 18-1

Timer (MSB) 0x25 R Upper 4 bits of free-running timer 18-2

WDR Clear 0x26 W Watchdog Reset clear -

Capture Timer A Rising 0x40 R Rising edge Capture Timer A data register 19-2

Capture Timer A Falling 0x41 R Falling edge Capture Timer A data register 19-3

Capture Timer B Rising 0x42 R Rising edge Capture Timer B data register 19-4

Capture Timer B Falling 0x43 R Falling edge Capture Timer B data register 19-5

Capture TImer Configuration 0x44 R/W Capture Timer configuration register 19-7

Capture Timer Status 0x45 R Capture Timer status register 19-6

SPI Data 0x60 R/W SPI read and write data register 17-2

SPI Control 0x61 R/W SPI status and control register 17-3

Clock Configuration 0xF8 R/W Internal / External Clock configuration register 9-2

Processor Status & Control 0xFF R/W Processor status and control 20-1

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9.0 Clocking

The chip can be clocked from either the internal on-chip clock, or from an oscillator based on an external resonator/crystal, as shown in Figure 9-1. No additional capacitance is included on chip at the XTALIN/OUT pins. Operation is controlled by the Clock Configuration Register, Figure 9-2.

Int Clk Output Disable

Internal Osc

Ext Clk Enable

CY7C63722C CY7C63723C CY7C63743C

XTALOUT

Clk2x (12 MHz)

(to Microcontroller)

Clock

Doubler

XTALIN

Clk1x (6 MHz)

(to USB SIE)

Port 2.1

Figure 9-1. Clock Oscillator On-chip Circuit

Bit # 76543210

Bit Name Ext. Clock

Resume

Delay

Wake-up Timer Adjust Bit [2:0] Low-voltage

Reset

Disable

Precision

USB

Clocking

Enable

Internal

Clock

Output

Disable

External

Oscillator

Enable

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000000

Figure 9-2. Clock Configuration Register (Address 0xF8)

Bit 7: Ext. Clock Resume Delay

External Clock Resume Delay bit selects the delay time when switching to the external oscillator from the internal oscillator mode, or when waking from suspend mode with the external oscillator enabled.

1 = 4 ms delay. 0 = 128 µs delay.

The delay gives the oscillator time to start up. The shorter time is adequate for operation with ceramic resonators, while the longer time is preferred for start-up with a crystal. (These times do not include an initial oscillator start-up time which depends on the resonating element. This time

Bit [6:4]: Wake-up Timer Adjust Bit [2:0]

The Wake-up Timer Adjust Bits are used to adjust the Wake-up timer period.

If the Wake-up interrupt is enabled in the Global Interrupt Enable Register, the microcontroller will generate wake-up interrupts periodically. The frequency of these periodical wake-up interrupts is adjusted by setting the Wake-up Timer Adjust Bit [2:0], as described in Section 11.2. One common use of the wake-up interrupts is to generate periodical wake-up events during suspend mode to check for changes, such as looking for movement in a mouse, while maintaining a low average power.

is typically 50–100 µs for ceramic resonators and 1–10 ms for crystals). Note that this bit only selects the delay time for the external clock mode. When waking from suspend mode with the internal oscillator (Bit 0 is LOW), the delay time is only 8 µs in addition to a delay of approximately 1 µs for the oscillator to start.

Bit 3: Low-voltage Reset Disable

When V ue of V the microcontroller enters a partial suspend state for a period of t Program execution begins from address 0x0000 after this t

START

drops below V

) and the Low-voltage Reset circuit is enabled,

LVR

(see Section 26.0 for the value of t

START

(see Section 25.0 for the val-

LVR

delay period. This provides time for VCC to stabilize

START

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before the part executes code. See Section 10.1 for more details.

1 = Disables the LVR circuit.

0 = Enables the LVR circuit.

Bit 2: Precision USB Clocking Enable

The Precision USB Clocking Enable only affects operation in internal oscillator mode. In that mode, this bit must be

set to 1 to cause the internal clock to automatically precisely tune to USB timing requirements (6 MHz ±1.5%).

The frequency may have a looser initial tolerance at power-up, but all USB transmissions from the chip will meet the USB specification.

1 = Enabled. The internal clock accuracy is 6 MHz ±1.5% after USB traffic is received.

0 = Disabled. The internal clock accuracy is 6 MHz ±5%.

Bit 1: Internal Clock Output Disable

The Internal Clock Output Disable is used to keep the internal clock from driving out to the XTALOUT pin. This bit has no effect in the external oscillator mode.

1 = Disable internal clock output. XTALOUT pin will drive HIGH.

0 = Enable the internal clock output. The internal clock is driven out to the XTALOUT pin.

Bit 0: External Oscillator Enable

At power-up, the chip operates from the internal clock by default. Setting the External Oscillator Enable bit HIGH disables the internal clock, and halts the part while the external resonator/crystal oscillator is started. Clearing this bit has no immediate effect, although the state of this bit is used when waking out of suspend mode to select between internal and external clock. In internal clock mode, XTALIN pin will be configured as an input with a weak pull-down and can be used as a GPIO input (P2.1).

1 = Enable the external oscillator. The clock is switched to external clock mode, as described in Section 9.1.

0 = Enable the internal oscillator.

9.1 Internal/External Oscillator Operation

The internal oscillator provides an operating clock, factory set to a nominal frequency of 6 MHz. This clock requires no external components. At power-up, the chip operates from the internal clock. In this mode, the internal clock is buffered and driven to the XTALOUT pin by default, and the state of the XTALIN pin can be read at Port 2.1. While the internal clock is enabled, its output can be disabled at the XTALOUT pin by setting the Internal Clock Output Disable bit of the Clock Configuration Register.

Setting the External Oscillator Enable bit of the Clock Configuration Register HIGH disables the internal clock, and halts the part while the external resonator/crystal oscillator is started. The steps involved in switching from Internal to External Clock mode are as follows:

1. At reset, chip begins operation using the internal clock.

2. Firmware sets Bit 0 of the Clock Configuration Register. For example,

mov A, 1h ; Set Bit 0 HIGH (External Oscil-

lator Enable bit). Bit 7 cleared gives faster start-up

iowr F8h ; Write to Clock Configuration

3. Internal clocking is halted, the internal oscillator is disabled, and the external clock oscillator is enabled.

4. After the external clock becomes stable, chip clocks are re-enabled using the external clock signal. (Note that the time for the external clock to become stable depends on the external resonating device; see next section.)

5. After an additional delay the CPU is released to run. This delay depends on the state of the Ext. Clock Resume Delay bit of the Clock Configuration Register. The time is 128 µs if the bit is 0, or 4 ms if the bit is 1.

6. Once the chip has been set to external oscillator, it can only return to internal clock when waking from suspend mode. Clearing bit 0 of the Clock Configuration Register will not re-enable internal clock mode until suspend mode is entered. See Section 11.0 for more details on suspend mode operation.

If the Internal Clock is enabled, the XTALIN pin can serve as a general purpose input, and its state can be read at Port 2, Bit 1 (P2.1). Refer to Figure 12-8 for the Port 2 Data Register. In this mode, there is a weak pull-down at the XTALIN pin. This input cannot provide an interrupt source to the CPU.

9.2 External Oscillator

The user can connect a low-cost ceramic resonator or an external oscillator to the XTALIN/XTALOUT pins to provide a precise reference frequency for the chip clock, as shown in Figure 9-1. The external components required are a ceramic resonator or crystal and any associated capacitors. To run from the external resonator, the External Oscillator Enable bit of the Clock Configuration Register must be set to 1, as explained in the previous section.

Start-up times for the external oscillator depend on the resonating device. Ceramic resonator based oscillators typically start in less than 100 µs, while crystal based oscillators take longer, typically 1 to 10 ms. Board capacitance should be minimized on the XTALIN and XTALOUT pins by keeping the traces as short as possible.

An external 6-MHz clock can be applied to the XTALIN pin if the XTALOUT pin is left open.

10.0 Reset

The USB Controller supports three types of resets. The effects of the reset are listed below. The reset types are:

1. Low-voltage Reset (LVR)

2. Brown Out Reset (BOR)

3. Watchdog Reset (WDR)

The occurrence of a reset is recorded in the Processor Status and Control Register (Figure 20-1). Bits 4 (Low-voltage or Brown-out Reset bit) and 6 (Watchdog Reset bit) are used to record the occurrence of LVR/BOR and WDR respectively. The firmware can interrogate these bits to determine the cause of a reset.

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The microcontroller begins execution from ROM address 0x0000 after a LVR, BOR, or WDR reset. Although this looks like interrupt vector 0, there is an important difference. Reset processing does NOT push the program counter, carry flag, and zero flag onto program stack. Attempting to execute either a RET or RETI in the reset handler will cause unpredictable execution results.

The following events take place on reset. More details on the various resets are given in the following sections.

1. All registers are reset to their default states (all bits cleared, except in Processor Status and Control Register).

2. GPIO and USB pins are set to high-impedance state.

3. The VREG pin is set to high-impedance state.

4. Interrupts are disabled.

5. USB operation is disabled and must be enabled by firmware if desired, as explained in Section 14.1.

6. For a BOR or LVR, the external oscillator is disabled and Internal Clock mode is activated, followed by a time-out period t the clock mode, and there is no delay for V on a WDR. Note that the External Oscillator Enable (Bit 0,

for VCC to stabilize. A WDR does not change

START

stabilization

Figure 9-2) will be cleared by a WDR, but it does not take effect until suspend mode is entered.

7. The Program Stack Pointer (PSP) and Data Stack Pointer (DSP) reset to address 0x00. Firmware should move the DSP for USB applications, as explained in Section 6.5.

8. Program execution begins at address 0x0000 after the appropriate time-out period.

10.1 Low-voltage Reset (LVR)

When V started and the Low-voltage Reset is initially enabled by default. At the point where V Section 25.0 for the value of V counting for a period of t of t

START

a partial suspend state to wait for V begins executing code from address 0x0000.

As long as the LVR circuit is enabled, this reset sequence repeats whenever the V LVR can be disabled by firmware by setting the Low-voltage

is first applied to the chip, the internal oscillator is

has risen above V

). During this t

), an internal counter starts

LVR

(see Section 26.0 for the value

START

time, the microcontroller enters

START

pin voltage drops below V

to stabilize before it

LVR

(see

. The

Reset Disable bit in the Clock Configuration Register (Figure 9-2). In addition, the LVR is automatically disabled in suspend mode to save power. If the LVR was enabled before entering suspend mode, it becomes active again once the suspend mode ends.

When LVR is disabled during normal operation (i.e., by writing ‘0’ to the Low-voltage Reset Disable bit in the Clock Configuration Register), the chip may enter an unknown state if V drops below V times during normal operation. If LVR is disabled (i.e., by

. Therefore, LVR should be enabled at all

LVR

firmware or during suspend mode), a secondary low-voltage monitor, BOR, becomes active, as described in the next section. The LVR/BOR Reset bit of the Processor Status and Control Register (Figure 20-1), is set to ‘1’ if either a LVR or BOR has occurred.

10.2 Brown Out Reset (BOR)

The Brown Out Reset (BOR) circuit is always active and behaves like the POR. BOR is asserted whenever the V voltage to the device is below an internally defined trip voltage

of approximately 2.5V. The BOR re-enables LVR. That is, once V

drops and trips BOR, the part remains in reset until V

rises above V normal operation resumes, and the microcontroller starts executing code from address 0x00 after the t

. At that point, the t

LVR

delay occurs before

START

delay.

In suspend mode, only the BOR detection is active, giving a reset if V is suspended and code is not executing, this lower reset

drops below approximately 2.5V. Since the device

voltage is safe for retaining the state of all registers and memory. Note that in suspend mode, LVR is disabled as discussed in Section 10.1.

10.3 Watchdog Reset (WDR)

The Watchdog Timer Reset (WDR) occurs when the internal Watchdog timer rolls over. Writing any value to the write-only Watchdog Reset Register at address 0x26 will clear the timer. The timer will roll over and WDR will occur if it is not cleared within t (Watchdog Reset bit) of the Processor Status and Control Register is set to record this event (see Section 20.0 for more details). A Watchdog Timer Reset typically lasts for 2–4 ms, after which the microcontroller begins execution at ROM address 0x0000.

(see Figure 10-1) of the last clear. Bit 6

WATCH

WATCH = 10.1 to

14.6 ms

WDR

(at F

OSC

= 6 MHz)

2–4 ms

At least 10.1 ms

since last write to WDR

WDR goes HIGH for 2–4 ms

Execution begins at

ROM Address 0x0000

Figure 10-1. Watchdog Reset (WDR, Address 0x26)

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11.0 Suspend Mode

The CY7C637xxC parts support a versatile low-power suspend mode. In suspend mode, only an enabled interrupt or a LOW state on the D–/SDATA pin will wake the part. Two options are available. For lowest power, all internal circuits can be disabled, so only an external event will resume operation. Alternatively, a low-power internal wake-up timer can be used to trigger the wake-up interrupt. This timer is described in Section 11.2, and can be used to periodically poll the system to check for changes, such as looking for movement in a mouse, while maintaining a low average power.

The CY7C637xxC is placed into a low-power state by setting the Suspend bit of the Processor Status and Control Register (Figure 20-1). All logic blocks in the device are turned off except the GPIO interrupt logic, the D–/SDATA pin input receiver, and (optionally) the wake-up timer. The clock oscillators, as well as the free-running and Watchdog timers are shut down. Only the occurrence of an enabled GPIO interrupt, wake-up interrupt, SPI slave interrupt, or a LOW state on the D–/SDATA pin will wake the part from suspend (D– LOW indicates non-idle USB activity). Once one of these resuming conditions occurs, clocks will be restarted and the device returns to full operation after the oscillator is stable and the selected delay period expires. This delay period is determined by selection of internal vs. external clock, and by the state of the Ext. Clock Resume Delay as explained in Section 9.0.

In suspend mode, any enabled and pending interrupt will wake the part up. The state of the Interrupt Enable Sense bit (Bit 2, Figure 20-1) does not have any effect. As a result, any interrupts not intended for waking from suspend should be disabled through the Global Interrupt Enable Register and the USB End Point Interrupt Enable Register (Section 21.0).

If a resuming condition exists when the suspend bit is set, the part will still go into suspend and then awake after the appropriate delay time. The Run bit in the Processor Status and Control Register must be set for the part to resume out of suspend.

Once the clock is stable and the delay time has expired, the microcontroller will execute the instruction following the I/O write that placed the device into suspend mode before servicing any interrupt requests.

To achieve the lowest possible current during suspend mode, all I/O should be held at either V GPIO bit interrupts (Figure 21-4 and Figure 21-5) should be disabled for any pins that are not being used for a wake-up interrupt. This should be done even if the main GPIO Interrupt Enable (Figure 21-1) is off.

Typical code for entering suspend is shown below:

... ; All GPIO set to low-power state (no floating

pins, and bit interrupts disabled unless using for wake-up)

... ; Enable GPIO and/or wake-up timer

interrupts if desired for wake-up

... ; Select clock mode for wake-up (see

Section 11.1) mov a, 09h ; Set suspend and run bits iowr FFh ; Write to Status and Control Register –

Enter suspend, wait for GPIO/wake-up

interrupt or USB activity nop ; This executes before any ISR ... ; Remaining code for exiting suspend

routine

or ground. In addition, the

11.1 Clocking Mode on Wake-up from Suspend

When exiting suspend on a wake-up event, the device can be configured to run in either Internal or External Clock mode. The mode is selected by the state of the External Oscillator Enable bit in the Clock Configuration Register (Figure 9-2). Using the Internal Clock saves the external oscillator start-up time and keeps that oscillator off for additional power savings. The external oscillator mode can be activated when desired, similar to operation at power-up.

The sequence of events for these modes is as follows:

Wake in Internal Clock Mode:

1. Before entering suspend, clear bit 0 of the Clock Configuration Register. This selects Internal clock mode after suspend.

2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.

3. After a wake-up event, the internal clock starts immediately (within 2 µs).

4. A time-out period of 8 µs passes, and then firmware execution begins.

5. At some later point, to activate External Clock mode, set bit 0 of the Clock Configuration Register. This halts the internal clocks while the external clock becomes stable. After an additional time-out (128 µs or 4 ms, see Section 9.0), firmware execution resumes.

Wake in External Clock Mode:

1. Before entering suspend, the external clock must be selected by setting bit 0 of the Clock Configuration Register. Make sure this bit is still set when suspend mode is entered. This selects External clock mode after suspend.

2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.

3. After a wake-up event, the external oscillator is started. The clock is monitored for stability (this takes approximately 50–100 µs with a ceramic resonator).

4. After an additional time-out period (128 µs or 4 ms, see Section 9.0), firmware execution resumes.

11.2 Wake-up Timer

The wake-up timer runs whenever the wake-up interrupt is enabled, and is turned off whenever that interrupt is disabled. Operation is independent of whether the device is in suspend mode or if the global interrupt bit is enabled. Only the Wake-up Timer Interrupt Enable bit (Figure 21-1) controls the wake-up timer.

Once this timer is activated, it will give interrupts after its time-out period (see below). These interrupts continue periodically until the interrupt is disabled. Whenever the interrupt is disabled, the wake-up timer is reset, so that a subsequent enable always results in a full wake-up time.

The wake-up timer can be adjusted by the user through the Wake-up Timer Adjust bits in the Clock Configuration Register (Figure 9-2). These bits clear on reset. In addition to allowing the user to select a range for the wake-up time, a firmware algorithm can be used to tune out initial process and operating condition variations in this wake-up time. This can be done by timing the wake-up interrupt time with the accurate 1.024-ms timer interrupt, and adjusting the Timer Adjust bits accordingly to approximate the desired wake-up time.

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Table 11-1. Wake-up Timer Adjust Settings

Adjust Bits [2:0]

(Bits [6:4] in Figure 9-2) Wake-up Time

000 (reset state) 1 * t

001 2 * t

010 4 * t

011 8 * t

100 16 * t

101 32 * t

110 6 4 * t

111 128 * t

See Section 26.0 for the value of t

WAKE

12.0 General Purpose I/O Ports

Ports 0 and 1 provide up to 16 versatile GPIO pins that can be read or written (the number of pins depends on package type). Figure 12-1 shows a diagram of a GPIO port pin.

CY7C63722C CY7C63723C CY7C63743C

(Data Reg must be 1 for SPI outputs)

Port Read

Interrupt

Logic

SPI Bypass (P0.5–P0.7 only)

(=1 if SPI inactive, or for non-SPI pins)

Internal Data Bus

GPIO Mode

Data Out Register

Port Write

Interrupt Polarity

Interrupt Enable

Figure 12-1. Block Diagram of GPIO Port (one pin shown)

Port 0 is an 8-bit port; Port 1 contains either 2 bits, P1.1–P1.0 in the CY7C63723C, or all 8 bits, P1.7–P1.0 in the CY7C63743C parts. Each bit can also be selected as an interrupt source for the microcontroller, as explained in Section

21.0.

The data for each GPIO pin is accessible through the Port Data register. Writes to the Port Data register store outgoing data state for the port pins, while reads from the Port Data register return the actual logic value on the port pins, not the Port Data register contents.

Control

14 kΩ

GPIO

Threshold Select

To Capture Timers (P0.0, P0.1)

and SPI (P0.4–P0.7))

To Interrupt Controller

Each GPIO pin is configured independently. The driving state of each GPIO pin is determined by the value written to the pin’s Data Register and by two associated pin’s Mode0 and Mode1 bits.

The Port 0 Data Register is shown in Figure 12-2, and the Port 1 Data Register is shown in Figure 12-3. The Mode0 and Mode1 bits for the two GPIO ports are given in Figure 12-4 through Figure 12-7.

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Bit # 76543210

Bit Name P0

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000000

Figure 12-2. Port 0 Data (Address 0x00)

Bit [7:0]: P0[7:0]

1 = Port Pin is logic HIGH

0 = Port Pin is logic LOW

Bit # 76543210

Bit Name P1

Notes Pins 7:2 only in CY7C63743C Pins 1:0 in

all parts

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000000

Figure 12-3. Port 1 Data (Address 0x01)

Bit [7:0]: P1[7:0]

1 = Port Pin is logic HIGH

0 = Port Pin is logic LOW

Bit # 76543210

Bit Name P0[7:0] Mode0

Read/Write WWWWWWWW

Reset 00000000

Figure 12-4. GPIO Port 0 Mode0 Register (Address 0x0A)

Bit [7:0]: P0[7:0] Mode 0

1 = Port 0 Mode 0 is logic HIGH

0 = Port 0 Mode 0 is logic LOW

Bit # 76543210

Bit Name P0[7:0] Mode1

Read/Write WWWWWWWW

Reset 00000000

Figure 12-5. GPIO Port 0 Mode1 Register (Address 0x0B)

Bit [7:0]: P0[7:0] Mode 1

1 = Port Pin Mode 1 is logic HIGH

0 = Port Pin Mode 1 is logic LOW

Bit # 76543210

Bit Name P1[7:0] Mode0

Read/Write WWWWWWWW

Reset 00000000

Figure 12-6. GPIO Port 1 Mode0 Register (Address 0x0C)

Bit [7:0]: P1[7:0] Mode 0

1 = Port Pin Mode 0 is logic HIGH

0 = Port Pin Mode 0 is logic LOW

Bit # 76543210

Bit Name P1[7:0] Mode1

Read/Write WWWWWWWW

Reset 00000000

Figure 12-7. GPIO Port 1 Mode1 Register (Address 0x0D)

Bit [7:0]: P1[7:0] Mode 1

1 = Port Pin Mode 1 is logic HIGH

0 = Port Pin Mode 1 is logic LOW

Each pin can be independently configured as high-impedance inputs, inputs with internal pull-ups, open drain outputs, or traditional CMOS outputs with selectable drive strengths.

The driving state of each GPIO pin is determined by the value written to the pin’s Data Register and by its associated Mode0 and Mode1 bits. Table 12-1 lists the configuration states based on these bits. The GPIO ports default on reset to all Data and Mode Registers cleared, so the pins are all in a high-impedance state. The available GPIO output drive strength are:

• Hi-Z Mode (Mode1 = 0 and Mode0 = 0) Q1, Q2, and Q3 (Figure 12-1) are OFF. The GPIO pin is not

driven internally. Performing a read from the Port Data Register return the actual logic value on the port pins.

• Low Sink Mode (Mode1 = 1, Mode0 = 0, and the pin’s Data Register = 0)

Q1 and Q3 are OFF. Q2 is ON. The GPIO pin is capable of sinking 2 mA of current.

• Medium Sink Mode (Mode1 = 0, Mode0 = 1, and the pin’s Data Register = 0)

Q1 and Q3 are OFF. Q2 is ON. The GPIO pin is capable of sinking 8 mA of current.

• High Sink Mode (Mode1 = 1, Mode0 = 1, and the pin’s Data Register = 0)

Q1 and Q3 are OFF. Q2 is ON. The GPIO pin is capable of sinking 50 mA of current.

• High Drive Mode (Mode1 = 0 or 1, Mode0 = 1, and the pin’s Data Register = 1)

Q1 and Q2 are OFF. Q3 is ON. The GPIO pin is capable of sourcing 2 mA of current.

• Resistive Mode (Mode1 = 1, Mode0 = 0, and the pin’s Data Register = 1)

Q2 and Q3 are OFF. Q1 is ON. The GPIO pin is pulled up with an internal 14-kΩ resistor.

Note that open drain mode can be achieved by fixing the Data and Mode1 Registers LOW, and switching the Mode0 register.

Input thresholds are CMOS, or TTL as shown in the table (See Section 25.0 for the input threshold voltage in TTL or CMOS modes). Both input modes include hysteresis to minimize noise sensitivity. In suspend mode, if a pin is used for a wake-up interrupt using an external R-C circuit, CMOS mode is preferred for lowest power.

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Table 12-1. Ports 0 and 1 Output Control Truth Table

Data

1Hi-ZTTL

1 High Drive CMOS

1 Resistive CMOS

1 High Drive CMOS

Mode1 Mode0 Output Drive

Strength

Hi-Z CMOS

Medium

(8 mA) Sink

Low (2 mA)

Sink

High (50 mA)

Sink

Input

Threshold

CMOS

12.1 Auxiliary Input Port

Port 2 serves as an auxiliary input port as shown in Figure 12-8. The Port 2 inputs all have TTL input thresholds.

Bit # 7 6 5 4 3 2 1 0

Reserved P2.1

Bit

Reserved D+

Name

Read/

Write

Reset 00 0 0 00 0 0

Bit [7:6]: Reserved

Bit [5:4]: D+ (SCLK) and D– (SDATA) States

Bit [3:2]: Reserved

Bit 1: P2.1 (Internal Clock Mode Only)

Bit 0: P2.0/VREG Pin State

-- R R -- R R

Figure 12-8. Port 2 Data Register (Address 0x02)

The state of the D+ and D– pins can be read at Port 2 Data Register. Performing a read from the port pins returns their logic values.

1 = Port Pin is logic HIGH

0 = Port Pin is logic LOW

In the Internal Clock mode, the XTALIN pin can serve as a general purpose input, and its state can be read at Port 2, Bit 1 (P2.1). See Section 9.1 for more details.

1 = Port Pin is logic HIGH

0 = Port Pin is logic LOW

In PS/2 mode, the VREG its state can be read at port P2.0. Section 15.0 for more details.

1 = Port Pin is logic HIGH

0 = Port Pin is logic LOW

(SCLK)

State

D–

(SDATA)

State

pin can be used as an input and

(Internal

Clock Mode Only)

P2.0

VREG

Stat e

13.0 USB Serial Interface Engine (SIE)

The SIE allows the microcontroller to communicate with the USB host. The SIE simplifies the interface between the microcontroller and USB by incorporating hardware that handles the following USB bus activity independently of the microcontroller:

• Translate the encoded received data and format the data to be transmitted on the bus.

• CRC checking and generation. Flag the microcontroller if errors exist during transmission.

• Address checking. Ignore the transactions not addressed to the device.

• Send appropriate ACK/NAK/STALL handshakes.

• Token type identification (SETUP, IN, or OUT). Set the appropriate token bit once a valid token is received.

• Place valid received data in the appropriate endpoint FIFOs.

• Send and update the data toggle bit (Data1/0).

• Bit stuffing/unstuffing.

Firmware is required to handle the rest of the USB interface with the following tasks:

• Coordinate enumeration by decoding USB device requests.

• Fill and empty the FIFOs.

• Suspend/Resume coordination.

• Verify and select Data toggle values.

13.1 USB Enumeration

A typical USB enumeration sequence is shown below. In this description, ‘Firmware’ refers to embedded firmware in the CY7C637xxC controller.

1. The host computer sends a SETUP packet followed by a DATA packet to USB address 0 requesting the Device descriptor.

2. Firmware decodes the request and retrieves its Device descriptor from the program memory tables.

3. The host computer performs a control read sequence and Firmware responds by sending the Device descriptor over the USB bus, via the on-chip FIFO.

4. After receiving the descriptor, the host sends a SETUP packet followed by a DATA packet to address 0 assigning a new USB address to the device.

5. Firmware stores the new address in its USB Device Address Register after the no-data control sequence completes.

6. The host sends a request for the Device descriptor using the new USB address.

7. Firmware decodes the request and retrieves the Device descriptor from program memory tables.

8. The host performs a control read sequence and Firmware responds by sending its Device descriptor over the USB bus.

9. The host generates control reads from the device to request the Configuration and Report descriptors.

10.Once the device receives a Set Configuration request, its functions may now be used.

11.Firmware should take appropriate action for Endpoint 1 and/or 2 transactions, which may occur from this point.

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13.2 USB Port Status and Control

USB status and control is regulated by the USB Status and Control Register as shown in Figure 13-1.

Bit # 76 5 4 3 2:0

Bit

PS/2

VREG

Name

Pull-up

Enable

Read/

R/W R/W R/W - R/W R/W

Write

Reset 00 0 0 0000

Figure 13-1. USB Status and Control Register (Address

Bit 7: PS/2 Pull-up Enable

This bit is used to enable the internal PS/2 pull-up resistors on the SDATA and SCLK pins. Normally the output high level on these pins is V clamped to approximately 1 Volt above V Enable bit is set, or if the Device Address is enabled (bit 7 of the USB Device Address Register, Figure 14-1).

1 = Enable PS/2 Pull-up resistors. The SDATA and SCLK pins are pulled up internally to V approximately 5 kΩ (see Section 25.0 for the value of R

PS2

0 = Disable PS/2 Pull-up resistors.

Bit 6: V

REG

Enable

A 3.3V voltage regulator is integrated on chip to provide a voltage source for a 1.5-kΩ pull-up resistor connected to the D– pin as required by the USB Specification. Note that the VREG output has an internal series resistance of approximately 200Ω, the external pull-up resistor required is approximately 1.3-kΩ (see Figure 16-1).

1 = Enable the 3.3V output voltage on the VREG pin.

0 = Disable. The VREG pin can be configured as an input.

Bit 5: USB-PS/2 Interrupt Select

This bit allows the user to select whether an USB bus reset interrupt or a PS/2 activity interrupt will be generated when the interrupt conditions are detected.

USB

Reset-

PS/2

Reserved USB

Bus

Activity

Interrupt

Mode

0x1F)

, but note that the output will be

REG

with two resistors of

D+/D–

Forcing

Bit

if the VREG

1 = PS/2 interrupt mode. A PS/2 activity interrupt will occur if the SDATA pin is continuously LOW for 128 to 256 µs.

0 = USB interrupt mode (default state). In this mode, a USB bus reset interrupt will occur if the single ended zero (SE0, D– and D+ are LOW) exists for 128 to 256 µs.

See Section 21.3 for more details.

Bit 4: Reserved. Must be written as a ‘0’.

Bit 3: USB Bus Activity

The Bus Activity bit is a “sticky” bit that detects any non-idle USB event has occurred on the USB bus. Once set to HIGH by the SIE to indicate the bus activity, this bit retains its logical HIGH value until firmware clears it. Writing a ‘0’ to this bit clears it; writing a ‘1’ preserves its value. The user firmware should check and clear this bit periodically to detect any loss of bus activity. Firmware can clear the Bus Activity bit, but only the SIE can set it. The 1.024-ms timer interrupt service routine is normally used to check and clear the Bus Activity bit.

1 = There has been bus activity since the last time this bit was cleared. This bit is set by the SIE.

0 = No bus activity since last time this bit was cleared (by firmware).

Bit [2:0]: D+/D– Forcing Bit [2:0]

Forcing bits allow firmware to directly drive the D+ and D– pins, as shown in Table 13-1. Outputs are driven with controlled edge rates in these modes for low EMI. For forcing the D+ and D– pins in USB mode, D+/D– Forcing Bit 2 should be 0. Setting D+/D– Forcing Bit 2 to ‘1’ puts both pins in an open-drain mode, preferred for applications such as PS/2 or LED driving.

Table 13-1. Control Modes to Force D+/D– Outputs

D+/D– Forcing

Control Action Application

Bit [2:0]

000 Not forcing (SIE controls driver) Any Mode

001 Force K (D+ HIGH, D– LOW) USB Mode

010 Force J (D+ LOW, D– HIGH)

011 Force SE0 (D– LOW, D+ LOW)

100 Force D– LOW, D+ LOW PS/2 Mode

101 Force D– LOW, D+ HiZ

110 Force D– HiZ, D+ LOW

111 Force D– HiZ, D+ HiZ

[2]

Note:

2. For PS/2 operation, the D+/D– Forcing Bit [2:0] = 111b mode must be set initially (one time only) before using the other PS/2 force modes.

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14.0 USB Device

The CY7C637xxC supports one USB Device Address with three endpoints: EP0, EP1, and EP2.

14.1 USB Address Register

The USB Device Address Register contains a 7-bit USB address and one bit to enable USB communication. This register is cleared during a reset, setting the USB device address to zero and marking this address as disabled. Figure 14-1 shows the format of the USB Address Register.

Bit # 7 6543210

Bit Name Device

Address

Enable

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 0 0000000

Figure 14-1. USB Device Address Register (Address 0x10)

In either USB or PS/2 mode, this register is cleared by both hardware resets and the USB bus reset. See Section 21.3 for more information on the USB Bus Reset – PS/2 interrupt.

Bit 7: Device Address Enable

This bit must be enabled by firmware before the serial interface engine (SIE) will respond to USB traffic at the address specified in Bit [6:0].

1 = Enable USB device address.

0 = Disable USB device address.

Bit [6:0]: Device Address Bit [6:0]

These bits must be set by firmware during the USB enumeration process (i.e., SetAddress) to the non-zero address assigned by the USB host.

14.2 USB Control Endpoint

All USB devices are required to have an endpoint number 0 (EP0) that is used to initialize and control the USB device. EP0 provides access to the device configuration information and allows generic USB status and control accesses. EP0 is bidirectional as the device can both receive and transmit data. EP0 uses an 8-byte FIFO at SRAM locations 0xF8-0xFF, as shown in Section 8.2.

The EP0 endpoint mode register uses the format shown in Figure 14-2.

Bit # 765 4 3:0

Bit

SETUP

Name

Received

Read/

Write

Reset 0 0 0 0 0000

Figure 14-2. Endpoint 0 Mode Register (Address 0x12)

R/W R/W R/W R/W R/W

Received

Device Address

OUT

Received

ACKed

Transaction

Mode Bit

The SIE provides a locking feature to prevent firmware from overwriting bits in the USB Endpoint 0 Mode Register. Writes to the register have no effect from the point that Bit[6:0] of the register are updated (by the SIE) until the firmware reads this register. The CPU can unlock this register by reading it.

Because of these hardware-locking features, firmware should perform an read after a write to the USB Endpoint 0 Mode Register and USB Endpoint 0 Count Register (Figure 14-4) to verify that the contents have changed as desired, and that the SIE has not updated these values.

Bit [7:4] of this register are cleared by any non-locked write to this register, regardless of the value written.

Bit 7: SETUP Received

1 = A valid SETUP packet has been received. This bit is forced HIGH from the start of the data packet phase of the SETUP transaction until the start of the ACK packet returned by the SIE. The CPU is prevented from clearing this bit during this interval. While this bit is set to ‘1’, the CPU cannot write to the EP0 FIFO. This prevents firmware from overwriting an incoming SETUP transaction before firmware has a chance to read the SETUP data.

0 = No SETUP received. This bit is cleared by any non-locked writes to the register.

Bit 6: IN Received

1 = A valid IN packet has been received. This bit is updated to ‘1’ after the last received packet in an IN transaction. This bit is cleared by any non-locked writes to the register.

0 = No IN received. This bit is cleared by any non-locked writes to the register.

Bit 5: OUT Received

1 = A valid OUT packet has been received. This bit is updated to ‘1’ after the last received packet in an OUT transaction. This bit is cleared by any non-locked writes to the register.

0 = No OUT received. This bit is cleared by any non-locked writes to the register.

Bit 4: ACKed Transaction

The ACKed Transaction bit is set whenever the SIE engages in a transaction to the register's endpoint that completes with an ACK packet.

1 = The transaction completes with an ACK.

0 = The transaction does not complete with an ACK.

Bit [3:0]: Mode Bit[3:0]

The endpoint modes determine how the SIE responds to USB traffic that the host sends to the endpoint. For example, if the endpoint Mode Bits [3:0] are set to 0001 which is NAK IN/OUT mode as shown in Table 22-1, the SIE will send NAK handshakes in response to any IN or OUT token sent to this endpoint. In this NAK IN/OUT mode, the SIE will send an ACK handshake when the host sends a SETUP token to this endpoint. The mode encoding is shown in Table 22-1. Additional information on the mode bits can be found in Table 22-2 and Table 22-3. These modes give the firmware total control on how to respond to different tokens sent to the endpoints from the host.

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In addition, the Mode Bits are automatically changed by the SIE in response to many USB transactions. For example, if the Mode Bit [3:0] are set to 1011 which is ACK OUT-NAK IN mode as shown in Table 22-1, the SIE will change the endpoint Mode Bit [3:0] to NAK IN/OUT (0001) mode after issuing an ACK handshake in response to an OUT token. Firmware needs to update the mode for the SIE to respond appropriately.

14.3 USB Non-control Endpoints

The CY7C637xxC feature two non-control endpoints, endpoint 1 (EP1) and endpoint 2 (EP2). The EP1 and EP2 Mode Registers do not have the locking mechanism of the EP0 Mode Register. The EP1 and EP2 Mode Registers use the format shown in Figure 14-3. EP1 uses an 8-byte FIFO at SRAM locations 0xF0–0xF7, EP2 uses an 8-byte FIFO at SRAM locations 0xE8–0xEF as shown in Section 8.2.

Bit # 7 65 4 3210

Bit

STALL Reserved ACKed

Name

Read/

Write

Reset 0 00 0 0000

Figure 14-3. USB Endpoint EP1, EP2 Mode Registers (Ad-

Bit 7: STALL

Bit [6:5]: Reserved. Must be written to zero during register

writes.

R/W - - R/C R/W R/W R/W R/W

dresses 0x14 and 0x16)

1 = The SIE will stall an OUT packet if the Mode Bits are set to ACK-OUT, and the SIE will stall an IN packet if the mode bits are set to ACK-IN. See Section 22.0 for the available modes.

0 = This bit must be set to LOW for all other modes.

Transaction

Mode Bit

14.4 USB Endpoint Counter Registers

There are three Endpoint Counter registers, with identical formats for both control and non-control endpoints. These registers contain byte count information for USB transactions, as well as bits for data packet status. The format of these registers is shown in Figure 14-4.

Bit # 7 6 5 4 3210

Bit Name Data

Toggle

Read/WriteR/W R/W - - R/WR/WR/WR/

Reset 0 0 0 0 0000

Figure 14-4. Endpoint 0,1,2 Counter Registers

(Addresses 0x11, 0x13 and 0x15)

Bit 7: Data Toggle

This bit selects the DATA packet's toggle state. For IN transactions, firmware must set this bit to the select the transmitted Data Toggle. For OUT or SETUP transactions, the hardware sets this bit to the state of the received Data Toggle bit.

1 = DATA1

0 = DATA0

Bit 6: Data Valid

This bit is used for OUT and SETUP tokens only. This bit is cleared to ‘0’ if CRC, bitstuff, or PID errors have occurred. This bit does not update for some endpoint mode settings. Refer to Table 22-3 for more details.

1 = Data is valid.

0 = Data is invalid. If enabled, the endpoint interrupt will occur even if invalid data is received.

Bit [5:4]: Reserved

Data Val id

Reserved Byte Count

Bit 4: ACKed Transaction

The ACKed transaction bit is set whenever the SIE engages in a transaction to the register's endpoint that completes with an ACK packet.

1 = The transaction completes with an ACK.

0 = The transaction does not complete with an ACK.

Bit [3:0]: Mode Bit [3:0]

The EP1 and EP2 Mode Bits operate in the same manner as the EP0 Mode Bits (see Section 14.2).

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Bit [3:0]: Byte Count Bit [3:0]

Byte Count Bits indicate the number of data bytes in a transaction: For IN transactions, firmware loads the count with the number of bytes to be transmitted to the host from the endpoint FIFO. Valid values are 0 to 8 inclusive. For OUT or SETUP transactions, the count is updated by hardware to the number of data bytes received, plus 2 for the CRC bytes. Valid values are 2 to 10 inclusive.

For Endpoint 0 Count Register, whenever the count updates from a SETUP or OUT transaction, the count register locks and cannot be written by the CPU. Reading the register unlocks it. This prevents firmware from overwriting a status update on incoming SETUP or OUT transactions before firmware has a chance to read the data.

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15.0 USB Regulator Output

The VREG pin provides a regulated output for connecting the pull-up resistor required for USB operation. For USB, a 1.5-kΩ resistor is connected between the D– pin and the V voltage, to indicate low-speed USB operation. Since the VREG output has an internal series resistance of approximately 200Ω, the external pull-up resistor required is R Section 25.0).

The regulator output is placed in a high-impedance state at reset, and must be enabled by firmware by setting the VREG Enable bit in the USB Status and Control Register (Figure 13-1). This simplifies the design of a combination PS/2-USB device, since the USB pull-up resistor can be left in place during PS/2 operation without loading the PS/2 line. In this mode, the V can be read at port P2.0. Refer to Figure 12-8 for the Port 2

pin can be used as an input and its state

REG

data register. This input has a TTL threshold.

In suspend mode, the regulator is automatically disabled. If VREG Enable bit is set (Figure 13-1), the VREG pin is pulled up to V proper V

with an internal 6.2-kΩ resistor. This holds the

state in suspend mode

Note that enabling the device for USB (by setting the Device Address Enable bit, Figure 14-1) activates the internal regulator, even if the VREG Enable bit is cleared to 0. This insures proper USB signaling in the case where the VREG pin is used as an input, and an external regulator is provided for the USB pull-up resistor. This also limits the swing on the D– and D+ pins to about 1V above the internal regulator voltage, so the Device Address Enable bit normally should only be set for USB operating modes.

The regulator output is only designed to provide current for the USB pull-up resistor. In addition, the output voltage at the

REG

(see

VREG pin is effectively disconnected when the CY7C637xxC device transmits USB from the internal SIE. This means that the VREG pin does not provide a stable voltage during transmits, although this does not affect USB signaling.

16.0 PS/2 Operation

The CY7C637xxC parts are optimized for combination USB or PS/2 devices, through the following features:

1. USB D+ and D– lines can also be used for PS/2 SCLK and SDATA pins, respectively. With USB disabled, these lines can be placed in a high-impedance state that will pull up to V

. (Disable USB by clearing the Address Enable bit of

the USB Device Address Register, Figure 14-1).

2. An interrupt is provided to indicate a long LOW state on the SDATA pin. This eliminates the need to poll this pin to check for PS/2 activity. Refer to Section 21.3 for more details.

3. Internal PS/2 pull-up resistors can be enabled on the SCLK and SDATA lines, so no GPIO pins are required for this task (bit 7, USB Status and Control Register, Figure 13-1).

4. The controlled slew rate outputs from these pins apply to both USB and PS/2 modes to minimize EMI.

5. The state of the SCLK and SDATA pins can be read, and can be individually driven LOW in an open drain mode. The pins are read at bits [5:4] of Port 2, and are driven with the Control Bits [2:0] of the USB Status and Control Register.

6. The V so that a USB pull-up resistor on the D–/SDATA pin will not interfere with PS/2 operation (bit 6, USB Status and Control Register).

The PS/2 on-chip support circuitry is illustrated in Figure 16-1.

pin can be placed into a high-impedance state,

REG

Port 2.0

VREG Enable

3.3V

200Ω

Regulator

PS/2 Pull-up Enable

5 kΩ

USB - PS/2 Driver

Port 2.5

Port 2.4

On-chip Off-chip

Figure 16-1. Diagram of USB-PS/2 System Connections

VREG

1.3 kΩ

D+/SCLK

D–/SDATA

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17.0 Serial Peripheral Interface (SPI)

SPI is a four-wire, full-duplex serial communication interface between a master device and one or more slave devices. The CY7C637xxC SPI circuit supports byte serial transfers in either Master or Slave modes. The block diagram of the SPI circuit is shown in Figure 17-1. The block contains buffers for

Data Bus

TX Buffer

8 bit shift register

RX Buffer

Data Bus

Write

Read

Figure 17-1. SPI Block Diagram

both transmit and receive data for maximum flexibility and throughput. The CY7C637xxC can be configured as either an SPI Master or Slave. The external interface consists of Master-Out/Slave-In (MOSI), Master-In/Slave-Out (MISO), Serial Clock (SCK), and Slave Select (SS

SPI modes are activated by setting the appropriate bits in the SPI Control Register, as described below.

MOSI

Master / Slave Control

MISO

SCK

Internal SCK

The SPI Data Register below serves as a transmit and receive buffer.

Bit # 76543210

Bit Name Data I/O

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000000

Figure 17-2. SPI Data Register (Address 0x60)

Bit [7:0]: Data I/O[7:0]

Writes to the SPI Data Register load the transmit buffer, while reads from this register read the receive buffer contents.

1 = Logic HIGH

0 = Logic LOW

17.1 Operation as an SPI Master

Only an SPI Master can initiate a byte/data transfer. This is done by the Master writing to the SPI Data Register. The Master shifts out 8 bits of data (MSB first) along with the serial clock SCK for the Slave. The Master’s outgoing byte is replaced with an incoming one from a Slave device. When the last bit is received, the shift register contents are transferred to the receive buffer and an interrupt is generated. The receive data must be read from the SPI Data Register before the next byte of data is transferred to the receive buffer, or the data will be lost.

When operating as a Master, an active LOW Slave Select (SS must be generated to enable a Slave for a byte transfer. This Slave Select is generated under firmware control, and is not part of the SPI internal hardware. Any available GPIO can be used for the Master’s Slave Select output.

When the Master writes to the SPI Data Register, the data is loaded into the transmit buffer. If the shift register is not busy shifting a previous byte, the TX buffer contents will be automatically transferred into the shift register and shifting will begin. If the shift register is busy, the new byte will be loaded into the shift register only after the active byte has finished and is transferred to the receive buffer. The new byte will then be shifted out. The Transmit Buffer Full (TBF) bit will be set HIGH until the transmit buffer’s data-byte is transferred to the shift register. Writing to the transmit buffer while the TBF bit is HIGH will overwrite the old byte in the transmit buffer.

The byte shifting and SCK generation are handled by the hardware (based on firmware selection of the clock source). Data is shifted out on the MOSI pin (P0.5) and the serial clock is output on the SCK pin (P0.7). Data is received from the slave on the MISO pin (P0.6). The output pins must be set to the desired drive strength, and the GPIO data register must be set to 1 to enable a bypass mode for these pins. The MISO pin must be configured in the desired GPIO input mode. See Section 12.0 for GPIO configuration details.

17.2 Master SCK Selection

The Master’s SCK is programmable to one of four clock settings, as shown in Figure 17-1. The frequency is selected with the Clock Select Bits of the SPI control register. The

)

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hardware provides 8 output clocks on the SCK pin (P0.7) for each byte transfer. Clock phase and polarity are selected by the CPHA and CPOL control bits (see Figure 17-1 and 17-4).

The master SCK duty cycle is nominally 33% in the fastest (2 Mbps) mode, and 50% in all other modes.

17.3 Operation as an SPI Slave

In slave mode, the chip receives SCK from an external master on pin P0.7. Data from the master is shifted in on the MOSI pin (P0.5), while data is being shifted out of the slave on the MISO pin (P0.6). In addition, the active LOW Slave Select must be asserted to enable the slave for transmit. The Slave Select pin is P0.4. These pins must be configured in appropriate GPIO modes, with the GPIO data register set to 1 to enable bypass mode selected for the MISO pin.

In Slave mode, writes to the SPI Data Register load the Transmit buffer. If the Slave Select is asserted (SS the shift register is not busy shifting a previous byte, the transmit buffer contents will be automatically transferred into the shift register. If the shift register is busy, the new byte will be loaded into the shift register only after the active byte has finished and is transferred to the receive buffer. The new byte is then ready to be shifted out (shifting waits for SCK from the Master). If the Slave Select is not active when the transmit buffer is loaded, data is not transferred to the shift register until Slave Select is asserted. The Transmit Buffer Full (TBF) bit will be set to ‘1’ until the transmit buffer’s data-byte is transferred to the shift register. Writing to the transmit buffer while the TBF bit is HIGH will overwrite the old byte in the Transmit Buffer.

If the Slave Select is deasserted before a byte transfer is complete, the transfer is aborted and no interrupt is generated. Whenever Slave Select is asserted, the transmit buffer is automatically reloaded into the shift register.

Clock phase and polarity must be selected to match the SPI master, using the CPHA and CPOL control bits (see Figure 17-3 and Figure 17-4).

The SPI slave logic continues to operate in suspend, so if the SPI interrupt is enabled, the device can go into suspend during a SPI slave transaction, and it will wake up at the interrupt that signals the end of the byte transfer.

LOW) and

17.4 SPI Status and Control

The SPI Control Register is shown in Figure 17-3. The timing diagram in Figure 17-4 shows the clock and data states for the various SPI modes.

Bit # 76543 210

Bit Name TCMP TBF Comm

Mode[1:0]

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000 000

Figure 17-3. SPI Control Register (Address 0x61)

Bit 7: TCMP

1 = TCMP is set to 1 by the hardware when 8-bit transfer is complete. The SPI interrupt is asserted at the same time TCMP is set to 1.

0 = This bit is only cleared by firmware.

Bit 6: TBF

Transmit Buffer Full bit.

1 = Indicates data in the transmit buffer has not transferred to the shift register.

0 = Indicates data in the transmit buffer has transferred to the shift register.

Bit [5:4] Comm Mode[1:0]

00 = All communications functions disabled (default).

01 = SPI Master Mode.

10 = SPI Slave Mode.

11 = Reserved.

Bit 3: CPOL

SPI Clock Polarity bit.

1 = SCK idles HIGH.

0 = SCK idles LOW.

Bit 2: CPHA

SPI Clock Phase bit (see Figure 17-4)

Bit [1:0]: SCK Select

Master mode SCK frequency selection (no effect in Slave Mode):

00 = 2 Mbit/s

01 = 1 Mbit/s

10 = 0.5 Mbit/s

11 = 0.0625 Mbit/s

CPOL CPHA SCK

Select

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SCK (CPOL = 0)

SCK (CPOL = 1)

CPHA = 0: MOSI/MISO

Data Capture Strobe

Interrupt Issued

CPHA = 1: MOSI/MISO

Data Capture Strobe

Interrupt Issued

FOR

MSB LSB

Figure 17-4. SPI Data Timing

CY7C63722C CY7C63723C CY7C63743C

17.5 SPI Interrupt

For SPI, an interrupt request is generated after a byte is received or transmitted. See Section 21.3 for details on the SPI interrupt.

17.6 SPI Modes for GPIO Pins

The GPIO pins used for SPI outputs (P0.5–P0.7) contain a bypass mode, as shown in the GPIO block diagram (Figure 12-1). Whenever the SPI block is inactive (Mode[5:4] = 00), the bypass value is 1, which enables normal GPIO

Table 17-1. SPI Pin Assignments

SPI Function GPIO Pin Comment

Slave Select (SS

Master Out, Slave In (MOSI) P0.5 Data output for master, data input for slave.

Master In, Slave Out (MISO) P0.6 Data input for master, data output for slave.

SCK P0.7 SPI Clock: Output for master, input for slave.

) P0.4 For Master Mode, Firmware sets SS, may use any GPIO pin.

operation. When SPI master or slave modes are activated, the appropriate bypass signals are driven by the hardware for outputs, and are held at 1 for inputs. Note that the corre-

sponding data bits in the Port 0 Data Register must be set to 1 for each pin being used for an SPI output. In addition,

the GPIO modes are not affected by operation of the SPI block, so each pin must be programmed by firmware to the desired drive strength mode.

For GPIO pins that are not used for SPI outputs, the SPI bypass value in Figure 12-1 is always 1, for normal GPIO operation.

For Slave Mode, SS

is an active LOW input.

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18.0 12-bit Free-running Timer

The 12-bit timer operates with a 1-µs tick, provides two interrupts (128-µs and 1.024-ms) and allows the firmware to directly time events that are up to 4 ms in duration. The lower eight bits of the timer can be read directly by the firmware. Reading the lower eight bits latches the upper four bits into a temporary register. When the firmware reads the upper four bits of the timer, it is actually reading the count stored in the temporary register. The effect of this is to ensure a stable 12-bit timer value can be read, even when the two reads are separated in time.

Bit # 76543210

Bit Name Timer [7:0]

Read/Write RRRRRRRR

Reset 00000000

Figure 18-1. Timer LSB Register (Address 0x24)

10 9 78

6 432

Bit [7:0]: Timer lower eight bits

Bit # 76543210

Bit Name Reserved Timer [11:8]

Read/Write ----RRRR

Reset 00000000

Figure 18-2. Timer MSB Register (Address 0x25)

Bit [7:4]: Reserved

Bit [3:0]: Timer upper four bits

1.024-ms interrupt

µs interrupt

128-

1 011

1 MHz clock

L1 L0L2L3

D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Figure 18-3. Timer Block Diagram

To Timer Registers

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19.0 Timer Capture Registers

Four 8-bit capture timer registers provide both rising- and falling-edge event timing capture on two pins. Capture Timer A is connected to Pin 0.0, and Capture Timer B is connected to Pin 0.1. These can be used to mark the time at which a rising or falling event occurs at the two GPIO pins. Each timer will

Free-running Timer

11 10 9 8 7 4 3 2 1 0

Prescaler

Mux

GPIO P0.0

First Edge Hold

Bit 7, Reg 0x44

Rising Edge Detect

Falling Edge Detect

capture eight bits of the free-running timer into its Capture Timer Data Register if a rising or falling edge event that matches the specified rising or falling edge condition at the pin. A prescaler allows selection of the capture timer tick size. Interrupts can be individually enabled for the four capture registers. A block diagram is shown in Figure 19-1.

6 5

1 MHz

Clock

8-bit Capture Registers

Timer A Rising Edge Time

Timer A Falling Edge Time

Rising Edge

GPIO P0.1

Detect

Falling Edge Detect

Capture A Rising Int Enable

Bit 0, Reg 0x44

Capture A Falling Int Enable

Bit 1, Reg 0x44

Capture B Rising Int Enable

Bit 2, Reg 0x44

Capture B Falling Int Enable

Bit 3, Reg 0x44

Figure 19-1. Capture Timers Block Diagram

The four Capture Timer Data Registers are read-only, and are shown in Figure 19-2 through Figure 19-5.

Out of the 12-bit free running timer, the 8-bit captured in the Capture Timer Data Registers are determined by the Prescale Bit [2:0] in the Capture Timer Configuration Register (Figure 19-7).

Timer B Rising Edge Time

Timer B Falling Edge Time

Capture Timer A Interrupt Request

Capture Timer B Interrupt Request

Bit # 76543210

Bit Name Capture A Rising Data

Read/Write RRRRRRRR

Reset 00000000

Figure 19-2. Capture Timer A-Rising, Data Register

(Address 0x40)

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Bit # 76543210

Bit Name Capture A Falling Data

Read/Write RRRRRRRR

Reset 00000000

Figure 19-3. Capture Timer A-Falling, Data Register

(Address 0x41)

Bit # 76543210

Bit Name Capture B Rising Data

Read/Write RRRRRRRR

Reset 00000000

Figure 19-4. Capture Timer B-Rising, Data Register

(Address 0x42)

Bit # 76543210

Bit Name Capture B Falling Data

Read/Write RRRRRRRR

Reset 00000000

Figure 19-5. Capture Timer B-Falling, Data Register

(Address 0x43)

Bit # 7654 3 2 1 0

Bit

Name

Read/

Reserved Capture

Falling

Event

Capture

B Rising Event

Capture

Falling

Event

Capture

Rising

Event

---- R R R R

Write

Reset 0000 0 0 0 0

Figure 19-6. Capture Timer Status Register (Address 0x45)

Bit [7:4]: Reserved.

Bit [3:0]: Capture A/B, Falling/Rising Event

These bits record the occurrence of any rising or falling edges on the capture GPIO pins. Bits in this register are cleared by reading the corresponding data register.

1 = A rising or falling event that matches the pin’s rising/falling condition has occurred.

0 = No event that matches the pin’s rising or falling edge condition.

Because both Capture A events (rising and falling) share an interrupt, user’s firmware needs to check the status of both Capture A Falling and Rising Event bits to determine what caused the interrupt. This is also true for Capture B events.

Bit # 7654 3 2 1 0

Int

Capture

Rising

Int

Enable

Bit

First

Name

Edge

Hold

Prescale Bit

[2:0]

Capture

Falling

Enable

Read/

R/W R/W R/W R/W R/W R/W R/W R/W

Capture

Falling

Enable

Int

Capture

Rising

Int

Enable

Write

Reset 0000 0 0 0 0

Figure 19-7. Capture Timer Configuration Register

(Address 0x44)

Bit 7: First Edge Hold

1 = The time of the first occurrence of an edge is held in the Capture Timer Data Register until the data is read. Subsequent edges are ignored until the Capture Timer Data Register is read.

0 = The time of the most recent edge is held in the Capture Timer Data Register. That is, if multiple edges have occurred before reading the capture timer, the time for the last one will be read (default state).

The First Edge Hold function applies globally to all four capture timers.

Bit [6:4]: Prescale Bit [2:0]

Three prescaler bits allow the capture timer clock rate to be selected among 5 choices, as shown in Ta bl e 19 -1 below.

Bit [3:0]: Capture A/B, Rising/Falling Interrupt Enable

Each of the four Capture Timer registers can be individually enabled to provide interrupts.

Both Capture A events share a common interrupt request, as do the two Capture B events. In addition to the event enables, the main Capture Interrupt Enables bit in the Global Interrupt Enable register (Section 21.0) must be set to activate a capture interrupt.

1 = Enable interrupt

0 = Disable interrupt

Table 19-1. Capture Timer Prescalar Settings (Step size and range for F

= 6 MHz)

CLK

LSB

Prescale

2:0 Captured Bits

Step Size Range

000 Bits 7:0 of free-running timer 1 µs256 µs

001 Bits 8:1 of free-running timer 2 µs512 µs

010 Bits 9:2 of free-running timer 4 µs1.024 ms

011 Bits 10:3 of free-running timer 8 µs2.048 ms

100 Bits 11:4 of free-running timer 16 µs4.096 ms

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20.0 Processor Status and Control Register

Bit # 76543210

Bit Name IRQ

Pending

Read/Write R R/W R/W R/W R/W R - R/W

Reset 01010001

Watchdog

Reset

Bus

Interrupt

Event

LVR/BOR

Reset

Suspend Interrupt

Enable

Sense

Figure 20-1. Processor Status and Control Register (Address 0xFF)

Reserved Run

Bit 7: IRQ Pending

When an interrupt is generated, it is registered as a pending interrupt. The interrupt will remain pending until its interrupt enable bit is set (Figure 21-1 and Figure 21-2) and interrupts are globally enabled (Bit 2, Processor Status and Control Register). At that point the internal interrupt handling sequence will clear the IRQ Pending bit until another interrupt is detected as pending. This bit is only valid if the Global Interrupt Enable bit is disabled.

1 = There are pending interrupts.

0 = No pending interrupts.

Bit 6: Watchdog Reset

The Watchdog Timer Reset (WDR) occurs when the internal Watchdog timer rolls over. The timer will roll over and WDR will occur if it is not cleared within t

26.0 for the value of t LVR/BOR. Note that a Watchdog reset can occur with a

). This bit is cleared by an

WATCH

(see Section

POR/LVR/BOR event, as discussed at the end of this section.

1 = A Watchdog reset occurs.

0 = No Watchdog reset

Bit 5: Bus Interrupt Event

The Bus Reset Status is set whenever the event for the USB Bus Reset or PS/2 Activity interrupt occurs. The event type (USB or PS/2) is selected by the state of the USB-PS/2 Interrupt Mode bit in the USB Status and Control Register (see Figure 13-1). The details on the event conditions that set this bit are given in Section 21.3. In either mode, this bit is set as soon as the event has lasted for 128–256 µs, and the bit will be set even if the interrupt is not enabled. The bit is only cleared by firmware or LVR/WDR.

1 = A USB reset occurred or PS/2 Activity is detected, depending on USB-PS/2 Interrupt Select bit.

0 = No event detected since last cleared by firmware or LVR/WDR.

Bit 4: LVR/BOR Reset

The Low-voltage or Brown-out Reset is set to ‘1’ during a power-on reset. Firmware can check bits 4 and 6 in the reset handler to determine whether a reset was caused by a LVR/BOR condition or a Watchdog timeout. This bit is not affected by WDR. Note that a LVR/BOR event may be followed by a Watchdog reset before firmware begins executing, as explained at the end of this section.

1 = A POR or LVR has occurred.

0 = No POR nor LVR since this bit last cleared.

Bit 3: Suspend

Writing a '1' to the Suspend bit will halt the processor and cause the microcontroller to enter the suspend mode that significantly reduces power consumption. An interrupt or USB bus activity will cause the device to come out of suspend. After coming out of suspend, the device will resume firmware execution at the instruction following the IOWR which put the part into suspend. When writing the suspend bit with a resume condition present (such as non-idle USB activity), the suspend state will still be entered, followed immediately by the wake-up process (with appropriate delays for the clock start-up). See Section 11.0 for more details on suspend mode operation.

1 = Suspend the processor.

0 = Not in suspend mode. Cleared by the hardware when resuming from suspend.

Bit 2: Interrupt Enable Sense

This bit shows whether interrupts are enabled or disabled. Firmware has no direct control over this bit as writing a zero or one to this bit position will have no effect on interrupts. This bit is further gated with the bit settings of the Global Interrupt Enable Register (Figure 21-1) and USB Endpoint Interrupt Enable Register (Figure 21-2). Instructions DI, EI, and RETI manipulate the state of this bit.

1 = Interrupts are enabled.

0 = Interrupts are masked off.

Bit 1: Reserved. Must be written as a 0.

Bit 0: Run

This bit is manipulated by the HALT instruction. When Halt is executed, the processor clears the run bit and halts at the end of the current instruction. The processor remains halted until a reset occurs (low-voltage, brown-out, or Watchdog). This bit should normally be written as a ‘1’.

During power-up, or during a low-voltage reset, the Processor Status and Control Register is set to 00010001, which indicates a LVR/BOR (bit 4 set) has occurred and no interrupts are pending (bit 7 clear). Note that during the t suspend at start-up (explained in Section 10.1), a Watchdog

START

ms partial

Reset will also occur. When a WDR occurs during the power-up suspend interval, firmware would read 01010001 from the Status and Control Register after power-up. Normally the LVR/BOR bit should be cleared so that a subsequent WDR can be clearly identified. Note that if a USB bus reset (long

SE0) is received before firmware examines this register, the Bus Interrupt Event bit would also be set.

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During a Watchdog Reset, the Processor Status and Control Register is set to 01XX0001, which indicates a Watchdog Reset (bit 4 set) has occurred and no interrupts are pending (bit 7 clear).

21.0 Interrupts

Interrupts can be generated by the GPIO lines, the internal free-running timer, the SPI block, the capture timers, on various USB events, PS/2 activity, or by the wake-up timer. All interrupts are maskable by the Global Interrupt Enable Register and the USB End Point Interrupt Enable Register. Writing a ‘1’ to a bit position enables the interrupt associated with that bit position. During a reset, the contents of the interrupt enable registers are cleared, along with the Global Interrupt enable bit of the CPU, effectively disabling all interrupts.

The interrupt controller contains a separate flip-flop for each interrupt. See Figure 21-3 for the logic block diagram of the interrupt controller. When an interrupt is generated it is first registered as a pending interrupt. It will stay pending until it is serviced or a reset occurs. A pending interrupt will only generate an interrupt request if it is enabled by the corresponding bit in the interrupt enable registers. The highest priority interrupt request will be serviced following the completion of the currently executing instruction.

When servicing an interrupt, the hardware will first disable all interrupts by clearing the Global Interrupt Enable bit in the CPU (the state of this bit can be read at Bit 2 of the Processor Status and Control Register). Next, the flip-flop of the current interrupt is cleared. This is followed by an automatic CALL instruction to the ROM address associated with the interrupt being serviced (i.e., the Interrupt Vector, see Section 21.1). The instruction in the interrupt table is typically a JMP instruction to the address of the Interrupt Service Routine (ISR). The user can re-enable interrupts in the interrupt service routine by executing an EI instruction. Interrupts can be nested to a level limited only by the available stack space.

The Program Counter value as well as the Carry and Zero flags (CF, ZF) are stored onto the Program Stack by the automatic CALL instruction generated as part of the interrupt acknowledge process. The user firmware is responsible for ensuring that the processor state is preserved and restored during an interrupt. The PUSH A instruction should typically be used as the first command in the ISR to save the accumulator value and the POP A instruction should be used just before the RETI instruction to restore the accumulator value. The program counter, CF and ZF are restored and interrupts are enabled when the RETI instruction is executed.

The DI and EI instructions can be used to disable and enable interrupts, respectively. These instructions affect only the Global Interrupt Enable bit of the CPU. If desired, EI can be used to re-enable interrupts while inside an ISR, instead of waiting for the RETI that exits the ISR. While the global interrupt enable bit is cleared, the presence of a pending

interrupt can be detected by examining the IRQ Sense bit (Bit 7 in the Processor Status and Control Register).

21.1 Interrupt Vectors

The Interrupt Vectors supported by the device are listed in Table 21-1. The highest priority interrupt is #1 (USB Bus Reset / PS/2 activity), and the lowest priority interrupt is #11 (Wake-up Timer). Although Reset is not an interrupt, the first instruction executed after a reset is at ROM address 0x0000, which corresponds to the first entry in the Interrupt Vector Table. Interrupt vectors occupy two bytes to allow for a two-byte JMP instruction to the appropriate Interrupt Service Routine (ISR).

Table 21-1. Interrupt Vector Assignments

Interrupt Vec-

tor Number

not applicable 0x0000 Execution after Reset begins

1 0x0002 USB Bus Reset or PS/2 Activity

2 0x0004 128-µs timer interrupt

3 0x0006 1.024-ms timer interrupt

4 0x0008 USB Endpoint 0 interrupt

5 0x000A USB Endpoint 1 interrupt

6 0x000C USB Endpoint 2 interrupt

7 0x000E SPI Interrupt

8 0x0010 Capture Timer A interrupt

9 0x0012 Capture Timer B interrupt

10 0x0014 GPIO interrupt

11 0x0016 Wake-up Timer interrupt

ROM

Address Function

here

interrupt

21.2 Interrupt Latency

Interrupt latency can be calculated from the following equation:

Interrupt Latency = (Number of clock cycles remaining in the

current instruction) + (10 clock cycles for the CALL instruction) + (5 clock cycles for the JMP instruction)

For example, if a 5 clock cycle instruction such as JC is being executed when an interrupt occurs, the first instruction of the Interrupt Service Routine will execute a minimum of 16 clocks (1+10+5) or a maximum of 20 clocks (5+10+5) after the interrupt is issued. With a 6-MHz external resonator, internal CPU clock speed is 12 MHz, so 20 clocks take 20/12 MHz =

1.67 µs.

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21.3 Interrupt Sources

The following sections provide details on the different types of interrupt sources.

Bit # 76543210

Bit Name Wake-up

Interrupt

Enable

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Reset 00000000

GPIO

Interrupt

Enable

Figure 21-1. Global Interrupt Enable Register (Address 0x20)

Capture Timer B

Intr. Enable

Capture Timer A

Intr. Enable

SPI

Interrupt

Enable

1.024-ms Interrupt

Enable

128-µs

Interrupt

Enable

USB Bus

Reset /

PS/2 Activity

Intr. Enable

Bit 7: Wake-up Interrupt Enable

The internal wake-up timer is normally used to wake the part from suspend mode, but it can also provide an interrupt when the part is awake. The wake-up timer is cleared whenever the Wake-up Interrupt Enable bit is written to a 0, and runs whenever that bit is written to a 1. When the interrupt is enabled, the wake-up timer provides periodic interrupts at multiples of period, as described in Section 11.2.

1 = Enable wake-up timer for periodic wake-up.

0 = Disable and power-off wake-up timer.

Bit 6: GPIO Interrupt Enable

Each GPIO pin can serve as an interrupt input. During a reset, GPIO interrupts are disabled by clearing all GPIO interrupt enable registers. Writing a ‘1’ to a GPIO Interrupt Enable bit enables GPIO interrupts from the corresponding input pin. These registers are shown in Figure 21-4 for Port 0 and Figure 21-5 for Port 1. In addition to enabling the desired individual pins for interrupt, the main GPIO interrupt must be enabled, as explained in Section 21.0.

The polarity that triggers an interrupt is controlled independently for each GPIO pin by the GPIO Interrupt Polarity Registers. Setting a Polarity bit to ‘0’ allows an interrupt on a falling GPIO edge, while setting a Polarity bit to ‘1’ allows an interrupt on a rising GPIO edge. The Polarity Registers reset to 0 and are shown in Figure 21-6 for Port 0 and Figure 21-7 for Port 1.

All of the GPIO pins share a single interrupt vector, which means the firmware will need to read the GPIO ports with enabled interrupts to determine which pin or pins caused an interrupt.The GPIO interrupt structure is illustrated in Figure 21-8.

Note that if one port pin triggered an interrupt, no other port pins can cause a GPIO interrupt until that port pin has returned to its inactive (non-trigger) state or its corresponding port interrupt enable bit is cleared. The CY7C637xxC does not assign interrupt priority to different port pins and the Port Interrupt Enable Registers are not affected by the interrupt acknowledge process.

1 = Enable

0 = Disable

Bit [5:4]: Capture Timer A and B Interrupts

There are two capture timer interrupts, one for each associated pin. Each of these interrupts occurs on an enabled

edge of the selected GPIO pin(s). For each pin, rising and/or falling edge capture interrupts can be in selected. Refer to Section 19.0. These interrupts are independent of the GPIO interrupt, described in the next section.

1 = Enable

0 = Disable

Bit 3: SPI Interrupt Enable

The SPI interrupt occurs at the end of each SPI byte transaction, at the final clock edge, as shown in Figure 17-4. After the interrupt, the received data byte can be read from the SPI Data Register, and the TCMP control bit will be high

1 = Enable

0 = Disable

Bit 2: 1.024-ms Interrupt Enable

The 1.024-ms interrupts are periodic timer interrupts from the free-running timer (based on the 6-MHz clock). The user should disable this interrupt before going into the suspend mode to avoid possible conflicts between servicing the timer interrupts (128-µs interrupt and 1.024-ms interrupt) first or the suspend request first when waking up.

1 = Enable. Periodic interrupts will be generated approximately every 1.024 ms.

0 = Disable.

Bit 1: 128-µs Interrupt Enable

The 128-µs interrupt is another source of timer interrupt from the free-running timer. The user should disable both timer interrupts (128-µs and 1.024-ms) before going into the suspend mode to avoid possible conflicts between servicing the timer interrupts first or the suspend request first when waking up.

1 = Enable. Periodic interrupts will be generated approximately every 128 µs.

0 = Disable.

Bit 0: USB Bus Reset - PS/2 Interrupt Enable

The function of this interrupt is selectable between detection of either a USB bus reset condition, or PS/2 activity. The selection is made with the USB-PS/2 Interrupt Mode bit in the USB Status and Control Register (Figure 13-1). In either case, the interrupt will occur if the selected condition exists for 256 µs, and may occur as early as 128 µs.

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A USB bus reset is indicated by a single ended zero (SE0) on the USB D+ and D– pins. The USB Bus Reset interrupt occurs when the SE0 condition ends. PS/2 activity is indicated by a continuous LOW on the SDATA pin. The PS/2 interrupt occurs as soon as the long LOW state is detected.

During the entire interval of a USB Bus Reset or PS/2 interrupt event, the USB Device Address register is cleared.

The Bus Reset/PS/2 interrupt may occur 128 µs after the bus condition is removed.

1 = Enable

0 = Disable

Bit # 76543 2 1 0

Bit Name Reserved EP2

Interrupt

Enable

Read/Write ----- R/W R/W R/W

Reset 00000 0 0 0

Figure 21-2. Endpoint Interrupt Enable Register

(Address 0x21)

Bit [7:3]: Reserved.

Bit [2:1]: EP2,1 Interrupt Enable

There are two non-control endpoint (EP2 and EP1) interrupts. If enabled, a non-control endpoint interrupt is generated when:

• The USB host writes valid data to an endpoint FIFO. However, if the endpoint is in ACK OUT modes, an in-

EP1

Interrupt

Enable

EP0

Interrupt

Enable

terrupt is generated regardless of data packet validity (i.e., good CRC). Firmware must check for data validity.

• The device SIE sends a NAK or STALL handshake packet to the USB host during the host attempts to read data from the endpoint (INs).

• The device receives an ACK handshake after a successful read transaction (IN) from the host.

• The device SIE sends a NAK or STALL handshake packet to the USB host during the host attempts to write data (OUTs) to the endpoint FIFO.

1 = Enable

0 = Disable

Refer to Table 22-1 for more information.

Bit 0: EP0 Interrupt Enable

If enabled, a control endpoint interrupt is generated when:

• The endpoint 0 mode is set to accept a SETUP token.

• After the SIE sends a 0-byte packet in the status stage of a control transfer.

• The USB host writes valid data to an endpoint FIFO. However, if the endpoint is in ACK OUT modes, an interrupt is generated regardless of what data is received. Firmware must check for data validity.

• The device SIE sends a NAK or STALL handshake packet to the USB host during the host attempts to read data from the endpoint (INs).

• The device SIE sends a NAK or STALL handshake packet to the USB host during the host attempts to write data (OUTs) to the endpoint FIFO.

1 = Enable EP0 interrupt

0 = Disable EP0 interrupt

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Wake-up

Int

USBPS/2 Int

EP2

Int

USB-PS/2 Clear

CLR

CLK

CLR

CLK

CLR

CLK

Enable [0]

(Reg 0x20)

Enable [2]

(Reg 0x21)

Enable [7]

(Reg 0x20)

USB-PS/2 IRQ 128-µs CLR

128-µs IRQ 1-ms CLR

1-ms IRQ

EP0 CLR EP0 IRQ

EP1 CLR EP1 IRQ

EP2 CLR EP2 IRQ

SPI CLR SPI IRQ

Capture A CLR Capture A IRQ

Capture B CLR Capture B IRQ

GPIO CLR GPIO IRQ

Wake-up CLR

Wake-up IRQ

Interrupt

Priority Encoder

Interrupt

Vector

IRQout

To CPU

CPU

Global

Interrupt

Enable

Bit

CLR

Interrupt

Acknowledge

IRQ Pending

(Bit 7, Reg 0xFF)

IRQ

Int Enable Sense

(Bit 2, Reg 0xFF)

Controlled by DI, EI, and RETI Instructions

Figure 21-3. Interrupt Controller Logic Block Diagram

Bit # 76543210

Bit Name P0 Interrupt Enable

Read/Write WWWWWWWW

Reset 00000000

Figure 21-4. Port 0 Interrupt Enable Register (Address

0x04)

Bit [7:0]: P0 [7:0] Interrupt Enable

1 = Enables GPIO interrupts from the corresponding input pin.

0 = Disables GPIO interrupts from the corresponding input pin.

Bit # 76543210

Bit Name P1 Interrupt Enable

Read/Write WWWWWWWW

Reset 00000000

Figure 21-5. Port 1 Interrupt Enable Register

(Address 0x05)

Bit [7:0]: P1 [7:0] Interrupt Enable

1 = Enables GPIO interrupts from the corresponding input pin.

0 = Disables GPIO interrupts from the corresponding input pin.

The polarity that triggers an interrupt is controlled independently for each GPIO pin by the GPIO Interrupt Polarity Registers. Figure 21-6 and Figure 21-7 control the interrupt polarity of each GPIO pin.

Bit # 76543210

Bit Name P0 Interrupt Polarity

Read/Write WWWWWWWW

Reset 00000000

Figure 21-6. Port 0 Interrupt Polarity Register

(Address 0x06)

Bit [7:0]: P0[7:0] Interrupt Polarity

1 = Rising GPIO edge

0 = Falling GPIO edge

Bit # 76543210

Bit Name P1 Interrupt Polarity

Read/Write WWWWWWWW

Reset 00000000

Figure 21-7. Port 1 Interrupt Polarity Register

(Address 0x07)

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Bit [7:0]: P1[7:0] Interrupt Polarity

1 = Rising GPIO edge

0 = Falling GPIO edge

Port Bit Interrupt

Polarity Register

GPIO Pin

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OR Gate

(1 input per

GPIO pin)

M U X

GPIO Interrupt Flip Flop

CLR

Interrupt

Priority

Encoder

IRQout

Interrupt

Vector

1 = Enable 0 = Disable

IRA

Port Bit Interrupt Enable Register

1 = Enable 0 = Disable

Global

GPIO Interrupt

Enable

(Bit 6, Register 0x20)

Figure 21-8. GPIO Interrupt Diagram

22.0 USB Mode Tables

The following tables give details on mode setting for the USB Serial Interface Engine (SIE) for both the control endpoint (EP0) and non-control endpoints (EP1 and EP2).

Table 22-1. USB Register Mode Encoding for Control and Non-Control Endpoints

Mode Encoding SETUP IN OUT Comments

Disable 0000 Ignore Ignore Ignore Ignore all USB traffic to this endpoint NAK IN/OUT 0001 Accept NAK NAK On Control endpoint, after successfully sending an ACK

handshake to a SETUP packet, the SIE forces the endpoint mode (from modes other than 0000) to 0001. The mode is also changed by the SIE to 0001 from mode

1011 on issuance of ACK handshake to an OUT. Status OUT Only 0010 Accept STALL Check For Control endpoints STALL IN/OUT 0011 Accept STALL STALL For Control endpoints Ignore IN/OUT 0100 Accept Ignore Ignore For Control endpoints Reserved 0101 Ignore Ignore Always Reserved Status IN Only 0110 Accept TX 0 Byte STALL For Control Endpoints Reserved 0111 Ignore TX Count Ignore Reserved NAK OUT 1000 Ignore Ignore NAK In mode 1001, after sending an ACK handshake to an

OUT, the SIE changes the mode to 1000

This mode is changed by the SIE to mode 1000 on

issuance of ACK handshake to an OUT

This mode is changed by the SIE to mode 1100 on

issuance of ACK handshake to an IN

ACK OUT( ACK OUT(STALL

STALL

[3]

=0)

[3]

=1)

1001 1001

Ignore Ignore

ACK

STALL NAK OUT - Status IN 1010 Accept TX 0 Byte NAK ACK OUT - NAK IN 1011 Accept NAK ACK This mode is changed by the SIE to mode 0001 on

NAK IN 1100 Ignore NAK Ignore An ACK from mode 1101 changes the mode to 1100

(STALL

[3]

=0)

[3]

=1)

1101 1101

Ignore Ignore

TX Count

STALL

Ignore

ACK IN ACK IN(STALL

NAK IN - Status OUT 1110 Accept NAK Check An ACK from mode 1111 changes the mode to 1110 ACK IN - Status OUT 1111 Accept TX Count Check This mode is changed by the SIE to mode 1110 on

Note:

3. STALL bit is the bit 7 of the USB Non-Control Device Endpoint Mode registers. Refer to Section 14.3 for more explanation.

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Mode Column:

The 'Mode' column contains the mnemonic names given to the modes of the endpoint. The mode of the endpoint is determined by the four-bit binaries in the 'Encoding' column as discussed below. The Status IN and Status OUT modes represent the status IN or OUT stage of the control transfer.

Encoding Column:

The contents of the 'Encoding' column represent the Mode Bits [3:0] of the Endpoint Mode Registers (Figure 14-2 and Figure 14-3). The endpoint modes determine how the SIE responds to different tokens that the host sends to the endpoints. For example, if the Mode Bits [3:0] of the Endpoint 0 Mode Register (Figure 14-2) are set to '0001', which is NAK IN/OUT mode as shown in Table 22-1 above, the SIE of the part will send an ACK handshake in response to SETUP tokens and NAK any IN or OUT tokens. For more information on the functionality of the Serial Interface Engine (SIE), see Section 13.0.

SETUP, IN, and OUT Columns:

Depending on the mode specified in the 'Encoding' column, the 'SETUP', 'IN', and 'OUT' columns contain the device SIE's responses when the endpoint receives SETUP, IN, and OUT tokens respectively.

A 'Check' in the Out column means that upon receiving an OUT token the SIE checks to see whether the OUT is of zero length and has a Data Toggle (Data1/0) of 1. If these conditions are true, the SIE responds with an ACK. If any of the above conditions is not met, the SIE will respond with either a STALL or Ignore. Table 22-3 gives a detailed analysis of all possible cases.

A 'TX Count' entry in the IN column means that the SIE will transmit the number of bytes specified in the Byte Count Bit

[3:0] of the Endpoint Count Register (Figure 14-4) in response to any IN token.

A 'TX 0 Byte' entry in the IN column means that the SIE will transmit a zero byte packet in response to any IN sent to the endpoint. Sending a 0 byte packet is to complete the status stage of a control transfer.

An 'Ignore' means that the device sends no handshake tokens.

An 'Accept' means that the SIE will respond with an ACK to a valid SETUP transaction.

Comments Column:

Some Mode Bits are automatically changed by the SIE in response to many USB transactions. For example, if the Mode Bits [3:0] are set to '1111' which is ACK IN-Status OUT mode as shown in Table 22-1, the SIE will change the endpoint Mode Bits [3:0] to NAK IN-Status OUT mode (1110) after ACKing a valid status stage OUT token. The firmware needs to update the mode for the SIE to respond appropriately. See Table 22-1 for more details on what modes will be changed by the SIE.

Any SETUP packet to an enabled endpoint with mode set to accept SETUPs will be changed by the SIE to 0001 (NAKing). Any mode set to accept a SETUP will send an ACK handshake to a valid SETUP token.

A disabled endpoint will remain disabled until changed by firmware, and all endpoints reset to the Disabled mode (0000). Firmware normally enables the endpoint mode after a SetConfiguration request.

The control endpoint has three status bits for identifying the token type received (SETUP, IN, or OUT), but the endpoint must be placed in the correct mode to function as such. Non-control endpoints should not be placed into modes that accept SETUPs.

Table 22-2. Decode table for Table 22-3: “Details of Modes for Differing Traffic Conditions”

Endpoint Mode

Encoding

3 2 1 0 Token count buffer dval DTOG DVAL COUNT

Received Token (SETUP, IN,OUT)

Legend:

Properties of incoming

packet

The validity of the received data Acknowledge transaction completed

The quality status of the DMA buffer PID Status Bits

The number of received bytes

UC: unchanged TX: transmit TX0: transmit 0-length packet

x: don’t care RX: receive

available for Control endpoint only

Changes to the internal register made by the SIE as a result of

the incoming token

Setup In Out ACK 3 2 1 0 Response Int

Bit[3:0], Figure 14-4 SIE’s Response

Data Valid (Bit 6, Figure 14-4) Endpoint Mode changed

Data 0/1 (Bit 7, Figure 14-4)

(Bit4,Figure 14-2/3)

(Bit[7:5], Figure 14-2)

End Point Mode

by the SIE.

Interrupt?

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The response of the SIE can be summarized as follows:

1. The SIE will only respond to valid transactions, and will ignore non-valid ones.

2. The SIE will generate an interrupt when a valid transaction is completed or when the FIFO is corrupted. FIFO corruption occurs during an OUT or SETUP transaction to a valid internal address, that ends with a non-valid CRC.

3. An incoming Data packet is valid if the count is <

Endpoint

Size + 2 (includes CRC) and passes all error checking;

4. An IN will be ignored by an OUT configured endpoint and visa versa.

5. The IN and OUT PID status is updated at the end of a transaction.

6. The SETUP PID status is updated at the beginning of the Data packet phase.

7. The entire Endpoint 0 mode register and the Count register are locked to CPU writes at the end of any transaction to that endpoint in which an ACK is transferred. These registers are only unlocked by a CPU read of these registers, and only if that read happens after the transaction completes. This represents about a 1-µs window in which the CPU is locked from register writes to these USB registers. Normally the firmware should perform a register read at the beginning of the Endpoint ISRs to unlock and get the mode register information. The interlock on the Mode and Count registers ensures that the firmware recognizes the changes that the SIE might have made during the previous transaction.

Table 22-3. Details of Modes for Differing Traffic Conditions

End Point Mode PID Set End Point Mode

3210

Rcved Token Count Buffer Dval DTOG DVAL COUNT SETUP IN OUT ACK 3 2 1 0 Response Int

SETUP Packet (if accepting)

See22-1 SETUP <= 10 data valid updates 1 updates 1 UC UC 1 0 0 0 1 ACK yes

See22-1 SETUP > 10 junk x updates updates updates 1 UC UC UC NoChange Ignore yes

See 22-1 SETUP x junk invalid updates 0 updates 1 UC UC UC NoChange Ignore yes

Disabled

0 0 0 0 x x UC x UC UC UC UC UC UC UC NoChange Ignore no

NAK IN/OUT

0 0 0 1 OUT x UC x UC UC UC UC UC 1 UC NoChange NAK yes

0 0 0 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

0 0 0 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

0 0 0 1 IN x UC x UC UC UC UC 1 UC UC NoChange NAK yes

Ignore IN/OUT

0 1 0 0 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

0 1 0 0 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

STALL IN/OUT

0 0 1 1 OUT x UC x UC UC UC UC UC 1 UC NoChange STALL yes

0 0 1 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 1 IN x UC x UC UC UC UC 1 UC UC NoChange STALL yes

Control Write

ACK OUT/NAK IN

1 0 1 1 OUT <= 10 data valid updates 1 updates UC UC 1 1 0 0 0 1 ACK yes

1 0 1 1 OUT > 10 junk x updates updates updates UC UC 1 UC NoChange Ignore yes

1 0 1 1 OUT x junk invalid updates 0 updates UC UC 1 UC NoChange Ignore yes

1 0 1 1 IN x UC x UC UC UC UC 1 UC UC NoChange NAK yes

NAK OUT/Status IN

1 0 1 0 OUT <= 10 UC valid UC UC UC UC UC 1 UC NoChange NAK yes

1 0 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 0 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 0 1 0 IN x UC x UC UC UC UC 1 UC 1 NoChange TX 0 Byte yes

Status IN Only

0 1 1 0 OUT <= 10 UC valid UC UC UC UC UC 1 UC 0 0 1 1 STALL yes

0 1 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

0 1 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

0 1 1 0 IN x UC x UC UC UC UC 1 UC 1 NoChange TX 0 Byte yes

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Table 22-3. Details of Modes for Differing Traffic Conditions (continued)

Control Read

ACK IN/Status OUT

1 1 1 1 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

1 1 1 1 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 1 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 1 IN x UC x UC UC UC UC 1 UC 1 1 1 1 0 ACK (back) yes

NAK IN/Status OUT

1 1 1 0 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

1 1 1 0 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

3 2 1 0 token count buffer dval DTOG DVAL COUNT SETUP IN OUT ACK 3 2 1 0 response int

1 1 1 0 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

1 1 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 1 1 0 IN x UC x UC UC UC UC 1 UC UC NoChange NAK yes

Status OUT Only

0 0 1 0 OUT 2 UC valid 1 1 updates UC UC 1 1 NoChange ACK yes

0 0 1 0 OUT 2 UC valid 0 1 updates UC UC 1 UC 0 0 1 1 STALL yes

0 0 1 0 OUT !=2 UC valid updates 1 updates UC UC 1 UC 0 0 1 1 STALL yes

0 0 1 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

0 0 1 0 IN x UC x UC UC UC UC 1 UC UC 0 0 1 1 STALL yes

OUT Endpoint

ACK OUT, STALL Bit = 0 (Figure 14-3)

1 0 0 1 OUT <= 10 data valid updates 1 updates UC UC 1 1 1 0 0 0 ACK yes

1 0 0 1 OUT > 10 junk x updates updates updates UC UC 1 UC NoChange Ignore yes

1 0 0 1 OUT x junk invalid updates 0 updates UC UC 1 UC NoChange Ignore yes

1 0 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

ACK OUT, STALL Bit = 1 (Figure 14-3)

1 0 0 1 OUT <= 10 UC valid UC UC UC UC UC 1 UC NoChange STALL yes

1 0 0 1 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 1 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

NAK OUT

1 0 0 0 OUT <= 10 UC valid UC UC UC UC UC 1 UC NoChange NAK yes

1 0 0 0 OUT > 10 UC x UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 0 OUT x UC invalid UC UC UC UC UC UC UC NoChange Ignore no

1 0 0 0 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

Reserved

0 1 0 1 OUT x updates updates updates updates updates UC UC 1 1 NoChange RX yes

0 1 0 1 IN x UC x UC UC UC UC UC UC UC NoChange Ignore no

IN Endpoint

ACK IN, STALL Bit = 0 (Figure 14-3)

1 1 0 1 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 0 1 IN x UC x UC UC UC UC 1 UC 1 1 1 0 0 ACK (back) yes

ACK IN, STALL Bit = 1 (Figure 14-3)

1 1 0 1 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 0 1 IN x UC x UC UC UC UC 1 UC UC NoChange STALL yes

NAK IN

Document #: 38-08022 Rev. *C Page 35 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

Table 22-3. Details of Modes for Differing Traffic Conditions (continued)

1 1 0 0 OUT x UC x UC UC UC UC UC UC UC NoChange Ignore no

1 1 0 0 IN x UC x UC UC UC UC 1 UC UC NoChange NAK yes

Reserved

0 1 1 1 Out x UC x UC UC UC UC UC UC UC NoChange Ignore no

0 1 1 1 IN x UC x UC UC UC UC 1 UC UC NoChange TX yes

Document #: 38-08022 Rev. *C Page 36 of 49

23.0 Register Summary

FOR

CY7C63722C CY7C63723C CY7C63743C

Address Register Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0x00 Port 0 Data P0 BBBBBBBB 00000000

0x01 Port 1 Data P1 BBBBBBBB 00000000

0x02 Port 2 Data Reserved D+(SCLK)

0x0A GPIO Port 0 Mode 0 P0[7:0] Mode0 WWWWWWWW 00000000

0x0B GPIO Port 0 Mode 1 P0[7:0] Mode1 WWWWWWWW 00000000

0x0C GPIO Port 1 Mode 0 P1[7:0] Mode0 WWWWWWWW 00000000

0x0D GPIO Port 1 Mode 1 P1[7:0] Mode1 WWWWWWWW 00000000

0x04 Port 0 Interrupt Enable P0[7:0] Interrupt Enable WWWWWWWW 00000000

0x05 Port 1 Interrupt Enable P1[7:0] Interrupt Enable WWWWWWWW 00000000

0x06 Port 0 Interrupt Polarity P0[7:0] Interrupt Polarity WWWWWWWW 00000000

0x07 Port 1 Interrupt Polarity P1[7:0] Interrupt Polarity WWWWWWWW 00000000

GPIO CONFIGURATION PORTS 0, 1 AND 2

0xF8 Clock Configuration Ext. Clock

Clock

Config.

0x10 USB Device Address Device

0x12 EP0 Mode SETUP

0x14,

CONFIGURATION

ENDPOINT 0, I AND 2

EP1, EP2 Mode Register STALL Reserved ACKed

0x16

0x11,

EP0,1, and 2 Counter Data 0/1

0x13, and

0x15

Resume

Delay

Address

Enable

ReceivedINReceived

Tog g le

Wake-up Timer Adjust Bit [2:0] Low-voltage

Received

Data Valid Reserved Byte Count BB--BBBB 00000000

Stat e

OUT

D- (SDATA)

Stat e

ACKed

Transaction

Reserved P2.1 (Int Clk

Reset

Disable

Device Address BBBBBBBB 00000000

Precision

Clocking

Enable

Mode Only

USB

Internal

Clock

Output

Disable

Mode Bit BBBBBBBB 00000000

Mode Bit B--BBBBB 00000000

VREG Pin

Stat e

External

Oscillator

Enable

Read/Write/

Both/

--RR--RR 00000000

BBBBBBBB 00000000

Default/

Reset

0x1F USB Status and Control PS/2 Pull-up

USB-

0x20 Global Interrupt Enable Wake-up

0x21 Endpoint Interrupt Enable Reserved EP2

INTERRUPT

0x24 Timer LSB Timer Bit [7:0] RRRRRRRR 00000000

0x25 Timer (MSB) Reserved Timer Bit [11:8] ----RRRR 00000000

TIMER

0x60 SPI Data Data I/O BBBBBBBB 00000000

0x61 SPI Control TCMP TBF Comm Mode [1:0] CPOL CPHA SCK Select BBBBBBBB 00000000

SPI

0x40 Capture Timer A-Rising,

Data Register

0x41 Capture Timer A-Falling,

Data Register

0x42 Capture Timer B-Rising,

Data Register

0x43 Capture Timer B-Falling,

Data Register

0x44 Capture Timer

CAPTURE TIMER

PROC

SC.

Configuration

0x45 Capture Timer Status Reserved Capture B

0xFF Process Status & Control IRQ

Enable

Interrupt

Enable

First Edge

Hold

Pending

VREG

Enable

GPIO

Interrupt

Enable

Watc h Do g

Reset

USB

Reset-PS/2

Activity

Interrupt

Mode

Capture

Timer B Intr.

Enable

Prescale Bit [2:0] Capture B

Bus

Interrupt

Event

Reserved USB Bus

Capture

Timer A Intr.

Enable

Capture A Rising Data RRRRRRRR 00000000

Capture A Falling Data RRRRRRRR 00000000

Capture B Rising Data RRRRRRRR 00000000

Capture B Falling Data RRRRRRRR 00000000

LVR /BO R

Reset

Activity

SPI

Interrupt

Enable

Falling Intr

Enable

Falling

Event

Suspend Interrupt

1.024 ms Interrupt

Enable

Interrupt

Enable

Capture B Rising Intr

Enable

Capture B

Rising Event

Enable

Sense

D+/D- Forcing Bit BBB-BBBB 00000000

128 µs

Interrupt

Enable

EP1

Interrupt

Enable

Capture A

Falling Intr

Enable

Capture A

Falling

Event

Reserved Run RBBBBR-B See

USB Bus Reset-PS/2 Activity Intr.

Enable

EP0

Interrupt

Enable

Capture A Rising Intr

Enable

Capture A

Rising Event

BBBBBBBB 00000000

-----BBB 00000000

BBBBBBBB 00000000

----BBBB 00000000

Section

20.0

Document #: 38-08022 Rev. *C Page 37 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

24.0 Absolute Maximum Ratings

Storage Temperature ..........................................................................................................................................–65°C to +150°C

Ambient Temperature with Power Applied...............................................................................................................–0°C to +70°C

Supply Voltage on V

DC Input Voltage........................................................................................................................................... –0.5V to +V

DC Voltage Applied to Outputs in High Z State............................................................................................ –0.5V to + VCC+0.5V

Maximum Total Sink Output Current into Port 0 and 1 and Pins.......................................................................................... 70 mA

Maximum Total Source Output Current into Port 0 and 1 and Pins ..................................................................................... 30 mA

Maximum On-chip Power Dissipation on any GPIO Pin ......................................................................................................50 mW

Power Dissipation ..............................................................................................................................................................300 mW

Static Discharge Voltage .................................................................................................................................................. > 2000V

Latch-up Current ........................................................................................................................................................... > 200 mA

25.0 DC Characteristics FOSC = 6 MHz; Operating Temperature = 0 to 70°C

CC1

CC2

CC1

CC2

SB1

SB2

RSNTR

SNK

SRC

Operating Voltage Note 4 V

Operating Voltage Note 4 4.35 5.25 V

VCC Operating Supply Current – Internal Oscillator Mode Typica l I

VCC Operating Supply Current – External Oscillator Mode Typica l I

Standby Current – No Wake-up Osc Oscillator off, D– > 2.7V 25 µA

Standby Current – With Wake-up Osc Oscillator off, D– > 2.7V 75 µA

Programming Voltage (disabled) –0.4 0.4 V

Resonator Start-up Interval VCC = 5.0V, ceramic resonator 256 µs

Input Leakage Current Any I/O pin 1 µA

Max ISS GPIO Sink Current Cumulative across all ports

Max ICC GPIO Source Current Cumulative across all ports

Relative to VSS..................................................................................................................–0.5V to +7.0V

Parameter Conditions Min. Max. Unit

General

5.5 V

20 mA

17 mA

70 mA

30 mA

CC1

CC2

= 16 mA

= 13 mA

LVR

= 5.5V, no GPIO loading

[5]

= 5.0V. T = Room Temperature

= 5.5V, no GPIO loading

= 5.0V. T = Room Temperature

[6]

+0.5V

Low-Voltage and Power-on Reset

LVR

VCCS

Low-Voltage Reset Trip Voltage VCC below V

for >100 ns

LVR

VCC Power-on Slew Time linear ramp: 0 to 4V

[8]

[7]

3.5 4.0 V

100 ms

USB Interface

REG

OHU

Notes:

4. Full functionality is guaranteed in V

5. Bench measurements taken under nominal operating conditions. Spec cannot be guaranteed at final test.

6. Total current cumulative across all Port pins, limited to minimize Power and Ground-Drop noise effects.

7. LVR is automatically disabled during suspend mode.

8. LVR will re-occur whenever V

9. V output is not regulated, and should not be used as a general source of regulated voltage in that case. During receive of USB data, the VREG output drops

when D– is LOW due to internal series resistance of approximately 200Ω at the VREG pin.

10. In suspend mode, V

VREG Regulator Output Voltage Load = RPU +R

Capacitance on VREG Pin External cap not required 300 pF

Static Output High, driven RPD to Gnd

range, except USB transmitter specifications and GPIO output currents are guaranteed for V

CC1

drops below V

specified for regulator enabled, idle conditions (i.e., no USB traffic), with load resistors listed. During USB transmits from the internal SIE, the VREG

REG

is only valid if RPU is connected from D– to VREG pin, and RPD is connected from D– to ground.

REG

. In suspend or with LVR disabled, BOR occurs whenever VCC drops below approximately 2.5V.

LVR

[9, 10]

[4]

3.0 3.6 V

2.8 3.6 V

range.

CC2

Document #: 38-08022 Rev. *C Page 38 of 49

FOR

25.0 DC Characteristics FOSC = 6 MHz; Operating Temperature = 0 to 70°C (continued)

Parameter Conditions Min. Max. Unit

OLU

OHZ

OLP

PS2

Static Output Low With RPU to VREG pin 0.3 V

Static Output High, idle or suspend R

connected D– to Gnd, RPU

connected D– to VREG pin

[4]

Differential Input Sensitivity |(D+)–(D–)| 0.2 V

Differential Input Common Mode Range 0.8 2.5 V

Single Ended Receiver Threshold 0.8 2.0 V

Transceiver Capacitance 20 pF

Hi-Z State Data Line Leakage 0 V < Vin<3.3 V (D+ or D– pins) –10 10 µA

External Bus Pull-up resistance (D–) 1.3 kΩ ±2% to V

REG

[11]

External Bus Pull-down resistance 15 kΩ ±5% to Gnd 14.25 15.75 kΩ

PS/2 Interface

Static Output Low Isink = 5 mA, SDATA or SCLK pins 0.4 V

Internal PS/2 Pull-up Resistance SDATA, SCLK pins, PS/2 Enabled 3 7 kΩ

CY7C63722C CY7C63723C CY7C63743C

2.7 3.6 V

1.274 1.326 kΩ

General Purpose I/O Interface

ICR

ICF

ITTL

OL1A

OL1B

OL2

OL3

XIN

Note:

11. The 200Ω internal resistance at the VREG pin gives a standard USB pull-up using this value. Alternately, a 1.5 kΩ,5%pull-up from D– to an external 3.3V supply can be used.

Pull-up Resistance 8 24 kΩ

Input Threshold Voltage, CMOS mode Low to high edge, Port 0 or 1 40% 60% V

Input Threshold Voltage, CMOS mode High to low edge, Port 0 or 1 35% 55% V

Input Hysteresis Voltage, CMOS mode High to low edge, Port 0 or 1 3% 10% V

Input Threshold Voltage, TTL mode Ports 0, 1, and 2 0.8 2.0 V

[4]

[4] [4]

[4]

0.8

0.4

0.4 V

V V

VCC–2 V

Output Low Voltage, high drive mode I

Output Low Voltage, medium drive mode I

Output Low Voltage, low drive mode I

= 50 mA, Ports 0 or 1

OL1

= 25 mA, Ports 0 or 1

OL1

= 8 mA, Ports 0 or 1

OL2

= 2 mA, Ports 0 or 1

OL3

Output High Voltage, strong drive mode Port 0 or 1, IOH = 2 mA

Pull-down resistance, XTALIN pin Internal Clock Mode only 50 kΩ

Document #: 38-08022 Rev. *C Page 39 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

26.0 Switching Characteristics

Parameter Description Conditions Min. Max. Unit

Internal Clock Mode

ICLK

ICLK2

CYC

START

WAKE

WATCH

Internal Clock Frequency Internal Clock Mode enabled 5.7 6.3 MHz

Internal Clock Frequency, USB mode

Internal Clock Mode enabled, Bit 2 of register 0xF8h is set (Precision USB Clocking)

[12]

5.91 6.09 MHz

External Oscillator Mode

Input Clock Cycle Time USB Operation, with External ±1.5%

164.2 169.2 ns

Ceramic Resonator or Crystal

Clock HIGH Time 0.45 t

Clock LOW Time 0.45 t

CYC

Reset Timing

Time-out Delay after LVR/BOR 24 60 ms

Internal Wake-up Period Enabled Wake-up Interrupt

WatchDog Timer Period F

= 6 MHz 10.1 14.6 ms

OSC

[13]

15ms

RFM

CRS

DRATE

DJR1

DJR2

DEOP

EOPR2

EOPT

UDJ1

UDJ2

LST

FPS2

USB Driver Characteristics

Transition Rise Time CLoad = 200 pF (10% to 90%

Transition Rise Time CLoad = 600 pF (10% to 90%

Transition Fall Time CLoad = 200 pF (10% to 90%

Transition Fall Time CLoad = 600 pF (10% to 90%

Rise/Fall Time Matching tr/t

Output Signal Crossover Volta ge

[18]

[4, 14]

CLoad = 200 to 600 pF

[4]

)75 ns

[4]

) 300 ns

[4]

)75 ns

[4]

) 300 ns

80 125 %

[4]

1.3 2.0 V

USB Data Timing

Low Speed Data Rate Ave. Bit Rate (1.5 Mb/s ±1.5%) 1.4775 1.5225 Mb/s

Receiver Data Jitter Tolerance To Next Transition

Receiver Data Jitter Tolerance For Paired Transitions

[15]

–75 75 ns

–45 45 ns

Differential to EOP transition Skew Note 15 –40 100 ns

EOP Width at Receiver Accepts as EOP

[15]

670 ns

Source EOP Width 1.25 1.50 µs

Differential Driver Jitter To next transition, Figure 26-5 –95 95 ns

Differential Driver Jitter To paired transition, Figure 26-5 –150 150 ns

Width of SE0 during Diff. Transition 210 ns

Non-USB Mode Driver

Note 16

Characteristics

SDATA/SCK Transition Fall Time CLoad = 150 pF to 600 pF 50 300 ns

SPI Timing See Figures 26-6 to 26-9

SMCK

SSCK

Notes:

12. Initially F

13. Wake-up time for Wake-up Adjust Bits cleared to 000b (minimum setting)

14. Tested at 200 pF.

15. Measured at cross-over point of differential data signals.

16. Non-USB Mode refers to driving the D–/SDATA and/or D+/SCLK pins with the Control Bits of the USB Status and Control Register, with Control Bit 2 HIGH.

17. SPI timing specified for capacitive load of 50 pF, with GPIO output mode = 01 (medium low drive, strong high drive).

18. Per the USB 2.0 Specification, Table 7.7, Note 10, the first transition from the Idle state is excluded.

SPI Master Clock Rate F

/3; see Figure 17-1 2MHz

CLK

SPI Slave Clock Rate 2.2 MHz

= F

ICLK2

until a USB packet is received.

ICLK

[17]

Document #: 38-08022 Rev. *C Page 40 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

26.0 Switching Characteristics (continued)

Parameter Description Conditions Min. Max. Unit

SCKH

SCKL

MDO

MDO1

MSU

MHD

SSU

SHD

SDO

SDO1

SSS

SSH

SPI Clock High Time High for CPOL = 0, Low for CPOL = 1 125 ns

SPI Clock Low Time Low for CPOL = 0, High for CPOL = 1 125 ns

Master Data Output Time SCK to data valid –25 50 ns

Master Data Output Time,

Time before leading SCK edge 100 ns

First bit with CPHA = 1

Master Input Data Set-up time 50 ns

Master Input Data Hold time 50 ns

Slave Input Data Set-up Time 50 ns

Slave Input Data Hold Time 50 ns

Slave Data Output Time SCK to data valid 100 ns

Slave Data Output Time,

Time after SS LOW to data valid 100 ns

First bit with CPHA = 1

Slave Select Set-up Time Before first SCK edge 150 ns

Slave Select Hold Time After last SCK edge 150 ns

CLOCK

crs

D+

D−

CYC

Figure 26-1. Clock Timing

90%

10%

90%

Figure 26-2. USB Data Signal Timing

10%

Document #: 38-08022 Rev. *C Page 41 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

PERIOD

Differential Data Lines

PERIOD

Differential Data Lines

PERIOD

JR1

Consecutive

Transitions

PERIOD

+ T

JR1

N * T

Paired

Transitions

PERIOD

+ T

JR2

N * T

Figure 26-3. Receiver Jitter Tolerance

Crossover

Point Extended

Point

Diff. Data to

N * T

SE0 Skew

+ T

PERIOD

DEOP

Source EOP Width: T

Receiver EOP Width: T

Figure 26-4. Differential to EOP Transition Skew and EOP Width

Crossover

Points

JR2

EOPT

, T

EOPR1

EOPR2

Consecutive

Transitions

PERIOD

+ T

xJR1

N * T

Paired

Transitions

PERIOD

+ T

xJR2

N * T

Figure 26-5. Differential Data Jitter

Document #: 38-08022 Rev. *C Page 42 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

SCK (CPOL=0)

SCK (CPOL=1)

MOSI

MISO

MDO

(SS is under firmware control in SPI Master mode)

SCKL

SCKH

MSB

MSB LSB

MSU

MHD

Figure 26-6. SPI Master Timing, CPHA = 0

LSB

SCK (CPOL=0)

SCK (CPOL=1)

MOSI

MISO

SSS

SCKL

SCKH

MSB LSB

SSU

SDO

SHD

MSB

LSB

SSH

Figure 26-7. SPI Slave Timing, CPHA = 0

Document #: 38-08022 Rev. *C Page 43 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

SCK (CPOL=0)

SCK (CPOL=1)

MOSI

MISO

MDO1

MSU

MHD

SCKH

MSB

(SS is under firmware control in SPI Master mode)

SCKL

MDO

Figure 26-8. SPI Master Timing, CPHA = 1

LSB

LSBMSB

SCK (CPOL=0)

SCK (CPOL=1)

MOSI

SDO1

MISO

SSS

SSU

SHD

SCKH

MSB

SCKL

SDO

Figure 26-9. SPI Slave Timing, CPHA = 1

SSH

LSBMSB

LSB

Document #: 38-08022 Rev. *C Page 44 of 49

FOR

CY7C63722C CY7C63723C CY7C63743C

27.0 Ordering Information

Ordering Code EPROM

Size

CY7C63723C-PXC 8 KB P3 18-Pin (300-Mil) Lead-free PDIP Commercial

CY7C63723C-SXC 8 KB S3 18-Pin Small Outline Lead-free Package Commercial

CY7C63743C-PXC 8 KB P13 24-Pin (300-Mil) Lead-free PDIP Commercial

CY7C63743C-SXC 8 KB S13 24-Pin Small Outline Lead-free Package Commercial

CY7C63743C-QXC 8 KB Q13 24-lead QSOP Lead-free Package Commercial

CY7C63722C-XC 8 KB – 25-Pad DIE Form Commercial

28.0 Package Diagrams

Package

Package Type Operating

Name

18-Lead (300-Mil) Molded DIP P3

Range

0.050[1.270] TYP.

18 Lead (300 Mil) SOIC - S3

10 18

0.447[11.353]

0.463[11.760]

0.013[0.330]

0.019[0.482]

18-Lead (300-Mil) Molded SOIC S3

PIN 1 ID

0.291[7.391]

0.300[7.620]

0.026[0.660]

0.032[0.812]

0.092[2.336]

0.105[2.667]

0.004[0.101]

0.0118[0.299]

0.394[10.007]

0.419[10.642]

SEATING PLANE

0.004[0.101]

DIMENSIONS IN INCHES[MM]

REFERENCE JEDEC MO-119

S18.3 STANDARD PKG.

SZ18.3 LEAD FREE PKG.

0.015[0.381]

0.050[1.270]

PART #

MIN. MAX.

51-85023-A

51-85010-*A

0.0091[0.231]

0.0125[0.317]

51-85023-*B

Document #: 38-08022 Rev. *C Page 45 of 49

FOR

28.0 Package Diagrams (continued)

PIN 1 ID

112

0.291[7.391]

0.300[7.620]

24-Lead (300-Mil) SOIC S13

DIMENSIONS IN INCHES[MM]

0.394[10.007]

0.419[10.642]

REFERENCE JEDEC MO-119

PACKAGE WEIGHT 0.65gms

CY7C63722C CY7C63723C CY7C63743C

MIN. MAX.

0.050[1.270] TYP.

13 24

0.597[15.163]

0.615[15.621]

0.013[0.330]

0.019[0.482]

0.026[0.660]

0.032[0.812]

0.004[0.101]

0.0118[0.299]

SEATING PLANE

0.092[2.336]

0.105[2.667]

0.004[0.101]

24-Lead (300-Mil) PDIP P13

S24.3 STANDARD PKG.

SZ24.3 LEAD FREE PKG.

0.015[0.381]

0.050[1.270]

PART #

0.0091[0.231]

0.0125[0.317]

51-85025-*B

51-85013-*B

Document #: 38-08022 Rev. *C Page 46 of 49

FOR

28.0 Package Diagrams (continued)

CY7C63722C CY7C63723C CY7C63743C

24-Lead Quarter Size Outline Q13

Cypress Logo

Die Step: 1907 x 3011 microns

Die Size: 1830.8 x 2909 microns

Die Thickness: 14 mils = 355.6 microns

Pad Size: 80 x 80 microns

DIE FORM

111213

4 5 6

8 9

(0,0)

22 21 20 19

51-85055-B

(1907, 3001)

Document #: 38-08022 Rev. *C Page 47 of 49

CY7C63722C CY7C63723C CY7C63743C

Table 28-1 below shows the die pad coordinates for the CY7C63722C-XC. The center location of each bond pad is relative to the bottom left corner of the die which has coordinate (0,0).

Table 28-1. CY7C63722C-XC Probe Pad Coordinates in microns ((0,0) to bond pad centers)

Pad Number Pin Name

(microns)

1 P0.0 788.95 2843.15

2 P0.1 597.45 2843.15

3 P0.2 406.00 2843.15

4 P0.3 154.95 2687.95

5 P1.0 154.95 2496.45

6 P1.2 154.95 2305.05

7 P1.4 154.95 2113.60

8 P1.6 154.95 1922.05

9 Vss 154.95 1730.90

10 Vss 154.95 312.50

11 Vpp 363.90 184.85

12 VREG 531.70 184.85

13 XTALIN 1066.55 184.85

14 XTALOUT 1210.75 184.85

15 Vcc 1449.75 184.85

16 D– 1662.35 184.85

17 D+ 1735.35 289.85

18 P1.7 1752.05 1832.75

19 P1.5 1752.05 2024.30

20 P1.3 1752.05 2215.75

21 P1.1 1752.05 2407.15

22 P0.7 1752.05 2598.65

23 P0.6 1393.25 2843.15

24 P0.5 1171.80 2843.15

25 P0.4 980.35 2843.15

(microns)

enCoRe is a trademark of Cypress Semiconductor Corporation. All product and company names mentioned in this document may be the trademarks of their respective holders.

Document #: 38-08022 Rev. *C Page 48 of 49

© Cypress Semiconductor Corporation, 2004. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges

FOR

CY7C63722C CY7C63723C CY7C63743C

Document History Page

Document Title: CY7C63722C, CY7C63723C, CY7C63743C enCoRe™ USB Combination Low-Speed USB and PS/2 Peripheral Controller Document Number: 38-08022

REV. ECN NO. Issue Date

** 118643 10/22/02 BON Converted from Spec 38-00944 to Spec 38-08022.

*A 243308 SEE ECN KKU Added 24 QSOP package

*B 267229 See ECN ARI Corrected part number in the Ordering Information section

*C 429169 See ECN TYJ Updated part numbers with ‘C’ part numbers

Orig. of Change Description of Change

Added notes 17, 18 to section 26 Removed obsolete parts (63722-PC and 63742) Added die sale Added section 23 (Register Summary)

Added Lead-free packages to section 27 Reformatted to update format

Changed to ‘Cypress Perform’ logo Added the 24-QSOP part offering

Document #: 38-08022 Rev. *C Page 49 of 49

CYPRESS CY7C63722C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1.0 Features

2.0 Logic Block Diagram

3.0 Functional Overview

4.0 Pin Configurations

5.0 Pin Definitions

6.0 Programming Model

6.1 Program Counter (PC)

6.2 8-bit Accumulator (A)

6.3 8-bit Index Register (X)

6.5 8-bit Data Stack Pointer (DSP)

6.4 8-bit Program Stack Pointer (PSP)

6.6 Address Modes

6.6.1 Data

6.6.2 Direct

6.6.3 Indexed

7.0 Instruction Set Summary

8.0 Memory Organization

8.2 Data Memory Organization

8.3 I/O Register Summary

9.0 Clocking

9.1 Internal/External Oscillator Operation

9.2 External Oscillator

10.0 Reset

10.1 Low-voltage Reset (LVR)

10.2 Brown Out Reset (BOR)

10.3 Watchdog Reset (WDR)

11.0 Suspend Mode

11.1 Clocking Mode on Wake-up from Suspend

11.2 Wake-up Timer

12.0 General Purpose I/O Ports

12.1 Auxiliary Input Port

13.0 USB Serial Interface Engine (SIE)

13.1 USB Enumeration

13.2 USB Port Status and Control

14.0 USB Device

14.1 USB Address Register

14.2 USB Control Endpoint

14.3 USB Non-control Endpoints

14.4 USB Endpoint Counter Registers

15.0 USB Regulator Output

16.0 PS/2 Operation

17.0 Serial Peripheral Interface (SPI)

17.1 Operation as an SPI Master

17.2 Master SCK Selection

17.3 Operation as an SPI Slave

17.4 SPI Status and Control

17.5 SPI Interrupt

17.6 SPI Modes for GPIO Pins

18.0 12-bit Free-running Timer

19.0 Timer Capture Registers

20.0 Processor Status and Control Register

21.0 Interrupts

21.1 Interrupt Vectors

21.2 Interrupt Latency

21.3 Interrupt Sources

22.0 USB Mode Tables

23.0 Register Summary

24.0 Absolute Maximum Ratings

26.0 Switching Characteristics

27.0 Ordering Information

28.0 Package Diagrams