EMC EM78612 User Manual

EM78612



       

Product

Specification

DOC. V

ELAN MICROELECTRONICS CORP.

ERSION

March 2006

1.0

Trademark Acknowledgments:

dg. #115 Lane 572, Bibo Road

IBM is a registered trademark and PS/2 is a trademark of IBM.
Windows is a trademark of Microsoft Corporation.

ELAN and ELAN logo are trademarks of ELAN Microelectronics Corporation.

Copyright

© 2006 by ELAN Microelectronics Corporation

All Rights Reserved

Printed in Taiwan

The contents of in this specification are subject to change without notice. ELAN Microelectronics assumes no
responsibility concerning the accuracy, adequacy, or completeness of this specification. ELAN Microelectronics
makes no commitment to update, or to keep current the information and material contained in this specification.
Such information and material may change to conform to each confirmed order.

In no event shall ELAN Microelectronics be made responsible to any claims attributed to errors, omissions, or
other inaccuracies in the information or material contained in this specification. ELAN Microelectronics shall not
be liable for direct, indirect, special incidental, or consequential damages arising out of the use of such information
or material.

The software (if any) described in this specification is furnished under a license or nondisclosure agreement, and
may be used or copied only in accordance with the terms of such agreement.

ELAN Microelectronics products are not intended for use in life support appliances, devices, or systems. Use of
ELAN Microelectronics product in such applications is not supported and is prohibited.
NO PART OF THIS SPECIFICATION MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM OR BY
ANY MEANS WITHOUT THE EXPRESS WRITTEN PERMISSION OF ELAN MICROELECTRONICS.

  

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(Europe)

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EM78612

Universal Serial Bus Microcontroller







1 General Description·················································································· 4

2 Features··································································································· 4

3 Applications

4 Pin Configuration

5 Pin Description

6 Function Block Diagram

7 Function Description

7.1 Program Memory ····························································································································8

7.2 Data Memory····································································································································9

7.2.1 Special Purpose Registers··································································································· 9

7.2.2 USB Application FIFOs···································································································· 21

7.3 I/O Ports··········································································································································22

7.3.1 Programmable Large Current···························································································· 22

7.3.2 Wakeup by Port Change Function ···················································································· 22

··············································································································· 5

····································································································· 6

········································································································· 7

························································································· 8

······························································································· 8

7.4 USB Application·····························································································································23

7.4.1 Detect PS/2 or USB Mode ································································································ 23

7.4.2 USB Device Controller····································································································· 24

7.4.3 Device Address and Endpoints ························································································· 24

7.5 Reset 24

7.5.1 Power-On Reset ················································································································ 24

7.5.2 WatchDog Reset················································································································ 25

7.5.3 USB Reset························································································································· 25

7.6 Power Saving Mode·······················································································································25

7.6.1 Power Down Mode ··········································································································· 25

7.6.2 Dual Clock Mode·············································································································· 26

7.7 Interrupt··········································································································································26

Product Specification (V1.0) 03.22.2006 •••• 1

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

8 Absolute Maximum Ratings···································································· 27

9 DC Electrical Characteristic

10

Application Cricuit···································································································· 30

················································································· 28

APPENDIX

A. Special Register Map

B. Instruction Set

········································································································· 32

C. Code option Register

···························································································· 31

···························································································· 34

2 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

Universal Serial Bus Microcontroller

Specification Revision History

Doc. Version Revision Description Date

1.0 Initial Version 2006/03/22

EM78612

Product Specification (V1.0) 03.22.2006 •••• 3

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

1 General Description

The EM78612 is a series of Universal Serial Bus 8-bit RISC microcontrollers. It is
specifically designed for USB low speed device application and to support legacy
device such as PS/2 mouse. The EM78612 also support one device address and two
endpoints..

The EM78612 is implemented on a RISC architecture. It has five-level stack and six
interrupt sources. The amount of General Input/Output pins is up to12. Each device
has 80 bytes SRAM. The ROM size of the EM78612 is 2K.

These series of chips have Dual Clock mode which allows the device to run on low
power saving frequency.

2 Features

 Low-cost solution for low-speed USB devices, such as mouse, joystick, and

gamepad.

 USB Specification Compliance

••••

Universal Serial Bus Specification Version 1.1

••••

USB Device Class Definition for Human Interface Device (HID), Firmware
Specification Version 1.1

••••

Support 1 device address and 2 endpoints (EP0 and EP1)

 USB Application

••••

USB protocol handling

••••

USB device state handling

••••

Identifies and decodes Standard USB commands to EndPoint Zero

 PS/2 Application Support

••••

Built-in PS/2 port interface

 Built-in 8-bit RISC MCU

••••

5 level stacks for subroutine and interrupt

••••

6 available interrupts

••••

8-bit real time clock/counter (TCC) with overflow interrupt

••••

Built-in RC oscillator free running for WatchDog Timer and Dual clock mode

••••

Two independent programmable prescalers for WDT and TCC

••••

Two methods of power saving:

1. Power-down mode (SLEEP mode)

2. Low frequency mode.

••••

Two clocks per instruction cycle

 I/O Ports

4 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

••••

Up to 12 general purposes I/O pins grouped into two ports (Port 6 and 7).

••••

Up to 2 LED sink pins

••••

Each GPIO pin of Ports 6 & Port 7 has an internal programmable pull-high
resistor

••••

Each GPIO pin of Ports 6 has an internal programmable pull- low resistor

••••

Each GPIO pin wakes up the MCU from sleep mode by input state change

 Internal Memory

••••

Built-in 2048*13 bits MASK ROM

••••

Built-in 80 bytes general purpose registers (SRAM)

••••

Built-in USB Application FIFOs.

 Operation Frequency

••••

Normal Mode: MCU runs on the external oscillator frequency

••••

Dual Clock Mode: MCU runs at the frequency of 256 KHz (or 32KHz, 4KHz,
500Hz), emitted by the internal oscillator with the external ceramic resonator
turned off to save power.

EM78612

Universal Serial Bus Microcontroller

 Built-in 3.3V Voltage Regulator

••••

For MCU power supply

••••

Pull-up source for the external USB resistor on D-pin.

 Package Type

••••

16 pin PDIP(300MIL) / SOP(150MIL) (EM78612 AP / AM)

••••

18 pin PDIP(300MIL) / SOP(300MIL) (EM78612 BP / BM)

••••

20 pin PDIP(300MIL) / SOP(300MIL) (EM78612 CP / CM)

••••

20 pin SSOP(209MIL) (EM78612 FM)

3 Applications

This microcontroller is designed for USB low speed device application or non-USB
embedded device. It is also suitable for PS/2 mouse application.

Product Specification (V1.0) 03.22.2006 •••• 5

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

4 Pin Configuration



16 P60

P61 1

EM78612A



P62 2 15 P64
P63 3 14 P65
P70 4 13 P71
P72 5 12 D+/P50

VSS 6 11 D-/P51

V

V3.3V 7 10

DD

OSCI 8 9 OSCO



18 P64

P60 1

EM78612B



P61 2 17 P65
P62 3 16 P66
P63 4 15 P67
P70 5 14 P71
P72 6 13 D+/P50

VSS7 12 D-/P51

V

8 11 V

3.3V

DD

OSCI 9 10 OSCO



20 P64

P60 1

EM78612C



P61 2 19 P65
P62 3 18 P66
P63 4 17 P67
P70 5 16 P71
P72 6 15 P73

NC 7 14 D+/P50

VSS8 13 D-/P51

V

9 12 V

3.3V

DD

OSCI 10 11 OSCO

6 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

5 Pin Description

When this pin is used as a PS/2 line interface, it will generate an interrupt when

Symbol I/O Function

OSCI I 6MHz / 12MHz ceramic resonator input.

EM78612

Universal Serial Bus Microcontroller

OSCO I/O

V

3.3V

O

P60 ~ P67 I/O

P70 ~ P73 I/O

D+ / P50 I/O

D- / P51 I/O

Return path for 6MHz / 12MHz ceramic resonator.

3.3V DC voltage output from internal regulator. This pin should be tied to a



4.7

F decoupling capacitor to GND.

Port6 offers up to 8 GIOP pins.
The pull high resistors (132K Ohms) and pull low resistors (10K Ohm) are

selected through pin programming.
Port7 offers up to 4 GIOP pins. The sink current of P70 & P71 are programmable

for driving LED.
Each pin has pull high resistors (132K Ohm) that can be selected through pin

programming.
USB Plus data line interface or PS/2 line interface are user-defined through

firmware setting.
When the EM78612 is running under PS/2 mode, this pin will have an internal

pulled-high resistor (2.2K Ohm), with VDD=5.0V.
When this pin is used as a PS/2 line interface, it will generate an interrupt when

its state changes (Port5 state change interrupt enable).
USB Minus data line interface or PS/2 line interface are user-defined through

firmware setting.

When the EM78612 is running under PS/2 mode, this pin will have an internal
pulled-high resistor (2.2K Ohm), with VDD=5.0V.

its state changes (Port5 state change interrupt enable).
When the EM78612 is running under USB mode, this pin will have an internal

pulled-high resistor, 1.5k Ohm, with V

V

DD

V

SS

Connects to the USB power source or to a nominal 5V-power supply. Actual V

­range can vary between 4.4V and 5.2V.

Connects to ground.

-

Table 5-1 Pin Descriptions

=3.3V.

3.3

DD

Product Specification (V1.0) 03.22.2006 •••• 7

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

6 Function Block Diagram

Built-in

RC

Reset &
Sleep &

Wake up

Control

I/O

Port 5

OSCI OSCO

Oscillator

Timing
Control

Prescaler

WDT

Timer

   

     

Prescaler

TCCWDT

R1

(TCC)

VDD V3.3

3.3V

Regulator

RAM

R4

(RSR)

D+ D-

Transceiver

USB

Device

Controller

DATA & CONTROL BUS







I/O

Port 6











Interrupt

Control

I/O

Port 7

ROM

Instruction

register

Instruction

Decoder

R2

(PC)









Stack1
Stack2
Stack3
Stack4
Stack5

R3

(Status)

ALU

ACC

Figure 6-1 EM78612 Series Function Block Diagram

7 Function Description

The memory of EM78612 is organized into four spaces, namely; User Program
Memory in 2048*13 bits MASK ROM space, Data Memory in 80 bytes SRAM space,
and USB Application FIFOs (for EndPoint0 and EndPoint1). Furthermore, several
registers are used for special purposes.

7.1 Program Memory

The program space of the EM78612 is 2K words, and is divided into two pages. Each
page has 1K words long. After Reset, the 12-bit Program Counter (PC) points to
location zero of the program space.

It has two interrupt vectors, i.e., Interrupt Vectors at 0x0001 and USB Application
Interrupt Vectors at 0x000A. The Interrupt Vector applies to TCC Interrupt, and Port 5
State Changed Interrupt. The USB Application Interrupt Vector is for USB EndPoint
Zero Interrupt, USB Suspend Interrupt, USB Reset interrupt, and USB Host Resume
Interrupt.

After an interrupt, the MCU will fetch the next instruction from the corresponding
address as illustrated in the following diagram.

8 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

After reset Address

EM78612

Universal Serial Bus Microcontroller

Program Counter

0x0000
0x0001

0x000A

0x03FF

0x0400

0x07FF

Reset Vector

Interrupt Vector

USB Application Interrupt Vector

Page 0

Page 1

7.2 Data Memory

The Data Memory has 80 bytes SRAM space. It is also equipped with USB Application
FIFO space for USB Application. The Figure 7-1 (next page) shows the organization of
the Data Memory Space.

7.2.1 Special Purpose Registers

When the micro-controller executes the instruction, specific registers are invoked for
assistance, such as; Status Register which records the calculation status, Port I/O
Control Registers which control the I/O pins’ direction, etc. The EM78612 series
provides a lot more of other special purpose registers with different functions.

There are 15 Special Operation Registers which are located from Address 0x00 to 0x0F.
On other hand, 10 more Special Control Registers are available to control functions or
I/O direction. These are arranged from Address 0x05 to 0x0F.

that Special Control Registers can only be read or written by two instructions; IOR and
IOW.

Note

Product Specification (V1.0) 03.22.2006 •••• 9

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

R0 (Indirection Addre ssin g Re gister)

00

R1 (Tim e Clock / Counter Register)

01

R2 (Program C ounter) & Stack

02

R3 (Status Register)

03

R4 (RAM Select Regis ter)

04

R5 (Data line I/O Register)

05

R6 (Port 6 I/O Register)

06

R7 (Port 7 I/O Register)

07

R8 (Port6 wakeup pin selection Register)

08

R9 (Port7 wakeup pin selection Register)

09

RC (US B Application Status Re gister)

0C

RD (US B Application FIFO address register)

0D

RE (USB Application FIFO data reg iste r)

0E

RF (Int erru pt S tatus Register)

0F
10

Gene ral Purpo se Register

1F

20

General Purpose

Registers

(Bank0)

3F

General Purpose

Registers

(Bank1)

IOC5 (Port 5 I/O Co ntrol Register)
IOC6 (Port 6 I/O Co ntrol Register)
IOC7 (Port 7 I/O Co ntrol Register)
IOC8 (Sink Curent Control R egis ter)

IOCA (O peration mo de C ontrol Register)
IOCB (Port 6 pull low Control Register)
IOCC (Port 6 pull high Control Register)
IOCD (Port 7 pull high Control Register)
IOCE (Special Function Contro l Reg ister)
IOCF (Inte rrup t Mask Register)

00
01
10

EP0's FIFO

EP1's FIFO
Data Byte Pointer of EP0
Data Byte Pointer of EP111

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Fig 7-1 The Organization of EM78612 Data RAM

7.2.1.1 Operation Registers in Bank 0

The following introduces each of the Operation Registers under the Special Purpose
Registers. The Operation Registers are arranged according to the order of registers’
address. Note that some registers are read only, while others are both readable and
writable.

R0 (Indirect Address Register) Default Value: (0B_0000_0000)

R0 is not a physically implemented register. Its major function is to be an indirect
address pointer. Any instruction using R0 as a pointer actually accesses the data
pointed by the RAM Select Register (R4).

R1 (Time / Clock Counter) Default Value: (0B_0000_0000)

This register TCC, is an 8-bit timer or counter. It is readable and writable as any other
register. The Timer module will increment every instruction cycle . The user can work
around this by writing an adjusted value. The Timer interrupt is generated when the R1
register overflows from FFh to 00h. This overflow sets bit TCIF(RF[0]). The interrupt
can be masked by clearing bit TCIE (IOCF[0]).After Power-on reset and WatchDog
reset, the initial value of this register is 0x00.

10 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

R2 (Program Counter & Stack) Default Value: (0B_0000_0000)

The EM78612 Program Counter is an 11-bit long register that allows access to 2K
bytes of Program Memory with 5 level stacks. The eight LSB bits, 00~07, are located at
R2, while the one MSB bits, 10, is located at R3 [5].The Program Counter is cleared
after Power-on reset or WatchDog reset. The first instruction that is executed after a
reset is located at Address 00h.





07 06R3

05

04 03 02 01 00

CALL

R2 09 08 07 06 05 04 03 02 01 00

PAGE0 0000 ~ 03FF

PAGE1 0400 ~ 07FF

10

0

1

RET
RETL
RETI

Stack1

Stack2

Stack3

Stack4

Stack5

Fig 7-2 The Structure of ROM Page

R3 (Status Register) Default Value:(0B_0001_1000)

7 6 5 4 3 2 1 0

- - PS0 T P Z DC C

R3 [0] Carry y/Borrow flag. For ADD , SUB Instructions

1 = A carry-out from the Most Significant bit of the result occurred

0 = No carry-out from the Most Significant bit of the result occurred

NOTE

For Borrow, the polarity is reversed.For rotate (RRC, RLC) instructions, this bit
is loaded with either the high or low-order bit of the source register

E

R3 [1] Auxiliary carry /borrow flag. For ADD , SUB Instructions

1 = A carry-out from the 4th low-order bit of the result occurred
0 = No carry-out from the 4th low-order bit of the result

NOTE

For Borrow, the polarity is reversed.

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EM78612

Universal Serial Bus Microcontroller

R3 [2] Zero flag. It will be set to 1 when the result of an arithmetic or logic operation is

zero.

R3 [3] Power down flag. It will be set to 1 during Power-on phase or by “WDTC”

command and cleared when the MCU enters into Power down mode. It remains
in previous state after WatchDog Reset.

1: Power-on.

0: Power down

R3 [4] Time-out flag. It will be set to 1 during Power-on phase or by “WDTC” command.

It is reset to 0 by WDT time-out.

1: WatchDog timer without overflow.

0: WatchDog timer with overflow.
The various states of Power down flag and Time-out flag at different conditions are
shown below:

Condition

1
1
0
1
1

1

Power-on reset

1

WDTC instruction

*P

WDT time-out

0

Power down mode

0

Wakeup caused by port change during Power down mode

*P: Previous status before WDT reset

R3 [5] Page selection bit. This bit is used to select a page of program memory (refer to

R2, Program Counter).

PS0 Program Memory Page [Address]

0 Page 0 [0000-03FF]

1 Page 1 [0400-07FF]

R3 [6,7] Reserved registers.

12 •••• Product Specification(V1.0) 03.22.2006

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EM78612

Universal Serial Bus Microcontroller

R4 (RAM Select Register) Default Value: (0B_0xxx_xxxx)

7 6 5 4 3 2 1 0

- BK0 Ad5 Ad4 Ad3 Ad2 Ad1 Ad0

R4 (RAM select register) contains the address of the registers.

R4 [0~5] are used to select registers in 0x00h~0x3Fh. The address 0x00~0x1F is

common space. After 0x1Fh, SRAM is grouped into two banks.

R4 [6] are used to select register banks. To select a registers bank, refer to the

following examples and the table below:
R4=01111100 points to the register 0x3C in Bank 1.

R4[6]Bk0 RAM Bank #

0
1

Bank 0
Bank 1

R5 (Data Line I/O Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

- - - - - - D- or DATA D+ or CLK

R5 [0] USB D+ line register or PS/2 clock interface register.

R5 [1] USB D- line register or PS/2 data interface register.

These two bits are BOTH writable and readable when the MCU is operating under PS/2
mode. But under USB Mode, these two bits cannot be accessed.

R5 [2~7] NON Used .The value is zero.

R6 (Port 6 I/O Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

P67 P66 P65 P64 P63 P62 P61 P60

R7 (Port 7 I/O Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

- - - - P73 P72 P71 P70

R8 (Port 6 Wake-up Pin Selection Register) Default Value: (0B_1111_1111)

7 6 5 4 3 2 1 0

/Wu67 /wu66 /Wu65 /Wu64 /Wu63 /Wu62 /Wu61 /Wu60

R8 [0 ~ 7] Select which of the Port 6 pins are to be defined to wake-up the MCU from

sleep mode. When the state of the selected pins changes during sleep
mode, the MCU will wake-up and execute the next instruction automatically.

1: Disable the wake-up function

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EM78612

Universal Serial Bus Microcontroller

0: Enable the wake-up function

R9 (Port 7 Wake-up Pin Selection Register) Default Value: (0B_1111_1111)

7 6 5 4 3 2 1 0

- - - - /Wu73 /Wu72 /Wu71 /Wu70

R9 [0 ~ 3] Select which of the Port 7 pins are to be defined to wake-up the MCU from

sleep mode. When the state of the selected pins changes during sleep
mode, the MCU will wake-up and execute the next instruction automatically.

1: Disable the wake-up function

0: Enable the wake-up function

RC (USB Application Status Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

EP0_W EP0_R EP1_R 0 Device_Resume Host_Suspend EP0_Busy Stall

RC [0] Stall flag. When MCU receives an unsupported command or invalid

parameters from host, this bit will be set to 1 by the firmware to notify the
UDC to return a STALL handshake. When a successful SETUP transaction
is received, this bit is cleared automatically. This bit is both readable and
writable.

RC [1] EP0 Busy flag. When this bit is equal to “1,” it indicates that the UDC is

writing data into the EP0’FIFO or reading data from it. During this time, the
firmware will avoid accessing the FIFO until UDC finishes writing or reading.
This bit is only readable.

RC [2] Host Suspend flag. If this bit is equal to 1, it indicates that USB bus has no

traffic for the specified period of 3.0 ms. This bit will also be cleared
automatically when a bus activity takes place. This bit is only readable.

,

This bit should be used in Dual Mode

RC [3] Device Resume flag. This bit is set by firmware to general a signal to

wake-up the USB host and is cleared as soon as the USB Suspend signal
becomes low. This bit can only be set by firmware and cleared by the
hardware.

-

This bit should be used in Dual Mode

RC [4] Undefined Register. The default value is 0.

RC [5,6] EP1_R / EP0_R flag. These two bits inform the UDC to read the data written

by firmware from the FIFO. Then the UDC sends the data to the host
automatically. After UDC finishes reading the data from the FIFO, this bit is
cleared automatically.

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EM78612

Universal Serial Bus Microcontroller

Therefore, before writing data into the FIFO, the firmware will first check this
bit to prevent overwriting the existing data. These two bits can only be set
by the firmware and cleared by the hardware.

RC [7] EP0_W flag. After the UDC completes writing data to the FIFO, this bit will

be set automatically. The firmware will clear it as soon as it gets the data
from EP0’s FIFO. Only when this bit is cleared that the UDC will be able to
write a new data into the FIFO.

Therefore, before the firmware can write a data into the FIFO, this bit must
first be set by the firmware to prevent UDC from writing data at the same
time. This bit is both readable and writable.

RD (USB Application FIFO Address Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

0 0 0 UAD4 UAD3 UAD2 UAD1 UAD0

RD [0~4] USB Application FIFO address registers. These five bits are the address

pointer of USB Application FIFO.

RD [5~7] Undefined registers. The default value is zero.

RE (USB Application FIFO Data Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

UD7 UD6 UD5 UD4 UD3 UD2 UD1 UD0

RE (USB Application FIFO data register) contains the data in the register of which
address is pointed by RD.

NOTE

For example, if we want to read the fourth byte of the EndPoint Zero, we will use the
address of EP0 (0x00) and Data Byte Pointer of EP0 (0x10) to access it.

// Read the 4rd byte of the EP0 FIFO

// First, assign the data byte pointer of EP0 register (0X10) with 0X03.

MOVA, @0X10

MOVRD, a // Move data in A to RD register

MOVA, @0X03

MOVRE , A // Move data in A to RE register

// Then read the content from EP0 FIFO (0x00) 4rd byte

MOVA, @0X00

MOVRD, A // Assign address point to EP0 FIFO

MOVA, RE // Read the fourth byte data (byte3) of the EP0 FIFO

MOV A, 0X0E// Read the fifth byte data (byte4) of the EP0 FIFO

Product Specification (V1.0) 03.22.2006 •••• 15

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EM78612

Universal Serial Bus Microcontroller

RF (Interrupt Status Register ) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

- --

Port 5 State

Change_IF

USB Host

Resume_IF

USB

Reset_IF

USB

Suspend_IF

EP0_IF TCC_IF

RF [0] TCC Overflow interrupt flag. It will be set while TCC overflows, and is

cleared by the firmware.

RF [1] EndPoint Zero interrupt flag. It will be set when the EM78612 receives

Vender /Customer Command to EndPoint Zero. This bit is cleared by the
firmware.

RF [2] USB Suspend interrupt flag. It will be set when the EM78612 finds the USB

Suspend Signal on USB bus. This bit is cleared by the firmware.

RF [3] USB Reset interrupt flag. It will be set when the host issues the USB Reset

signal.

RF [4] USB Host Resume interrupt flag. It is set only under Dual Clock mode when

the USB suspend signal becomes low.

RF [5] Port 5 State Change interrupt flag. It is set when the Port 5 state changes .

(Port 5 state change interrupt only work in PS/2 mode.)

RF [6] Default value is zero and do not modify it.

R10~R1F are General purpose registers. These registers can be used no matter what
Bank Selector is. There are 2 banks(BK0 & BK1) R20~R3F General purpose registers,
Select by R4 [6].

7.2.1.2 Control Registers in Bank 0

Special purpose registers for special control purposes are also available. Except for the
Accumulator (A), these registers must be read and written by special instructions. One
of these registers, CONT, can only be read by the instruction "CONTR" and written by
"CONTW" instruction. The remaining special control registers can be read by the
instruction "IOR" and written by the instruction "IOW."

A (Accumulator Register)

The accumulator is an 8-bit register that holds operands and results of arithmetic
calculations. It is not addressable.

16 •••• Product Specification(V1.0) 03.22.2006

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EM78612

Universal Serial Bus Microcontroller

CONT (Control Register)

7 6 5 4 3 2 1 0

RW_E /INT TSR2 TSR1 TSR0 PSR2 PSR1 PSR0

NOTE

The CONT register can be read by the instruction "CONTR" and written by the
instruction “CONTW."

CONT [0~2] WatchDog Timer prescaler bits. These three bits are used as the

prescaler of WatchDog Timer.

CONT [3~5] TCC Timer prescaler bits.

The relationship between the prescaler value and these bits are as shown below:

PSR2/TSR2 PSR1/TSR1 PSR0/TSR0 TCC Rate WDT Rate

( 8mS )

0 0 0 6MHz / 2 8 ms
0 0 1 6MHz / 4 16 ms
0 1 0 6MHz / 8 32 ms
0 1 1 6MHz / 16 64 ms
1 0 0 6MHz / 32 128 ms
1 0 1 6MHz / 64 256 ms
1 1 0 6MHz / 128 512 ms
1 1 1 6MHz / 256 1024 ms

CONT [6] Interrupt enable control bit. This bit toggles Interrupt function between

enable and disable. It is set to 1 by the interrupt disable instruction "DISI"
and reset by the interrupt enable instructions "ENI" or "RETI."

0: Enable the Interrupt function.

1: Disable the Interrupt function.

CONT [7] Remote wake-up enable bit. This bit is set to 1, if host enables device to

remote wake-up PC. It could be modified by SetFeature() & ClearFeature()
Request.

IOC5 ~IOC7 I/O Port Direction Control Registers

Each bit controls the I/O direction of three I/O ports ( Port5~Port7 ) respectively. When
these bits are set to 1, the relative I/O pins become input pins. Similarly, the I/O pins
becomes outputs when the relative control bits are cleared.

1: Input direction.

0: Output direction.

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EM78612

Universal Serial Bus Microcontroller

IOC5 (Data Line I/O Control Register) Default Value: (0B_0000_0011)

7 6 5 4 3 2 1 0

0 0 0 0 0 0 P51 P50

IOC5 [2~7] Undefined registers. The default value is 0.

IOC6 (Port 6 I/O Control Register) Default Value: (0B_1111_1111)

7 6 5 4 3 2 1 0

P67 P66 P65 P64 P63 P62 P61 P60

IOC7 (Port 7 I/O Control Register) Default Value: (0B_0000_1111)

7 6 5 4 3 2 1 0

- - - - P73 P72 P71 P70

IOC8 (Sink Current Control Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

0 0 Sink1.1 Sink1.0 0 0 Sink01 Sink0.0

IOC8 [0,1][4,5] are P70/P71 sink current control registers. Four levels are offered for

selection:

Sink0.1/1.1 Sink0.0/1.0 Sink Current

0 0 3mA±10%
0 1 6mA±10%

1 0 12mA±10%
1 1 25mA±10%

The default current after Power-on reset is 3mA.

IOCA (Operation Mode Control Register) Default Value: (0B_1100_0011)

7 6 5 4 3 2 1 0

Dual_Frq.1 Dual_Frq.0 0 0 0 0 PS/2 USB

IOCA [0,1] These two bits are used to select the operation mode. The definition of

these two control registers is described in the table below.

IOCA[1] IOCA[0] Operation Mode

0 0 Detect Mode
0 1 USB Mode

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EM78612

Universal Serial Bus Microcontroller

1 0 PS/2 Mode
1 1 USB Test Mode

IOCA [2~5] Undefined registers. The default value is 0.

IOCA [6,7] Select the operation frequency in Dual Clock Mode. Four frequencies

are available and can be chosen as Dual Clock mode for running the
MCU program.

Dual_Frq.1 Dual_Frq.0 Frequency

0 0 500Hz
0 1 4kHz
1 0 32kHz
1 1 256kHz

IOCB (Port 6 Pull-Low Control Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

PL67 PL66 PL65 PL64 PL63 PL62 PL61 PL60

IOCB [0~7] Select whether the 10K Ohm pull-low resistor of Port 6 individual pin is

connected or not.

1: Enable the pull-low function.

0: Disable the pull-low function.

IOCC (Port 6 Pull-High Control Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

PH67 PH66 PH65 PH64 PH63 PH62 PH61 PH60

IOCC [0~7] Select whether the 132K Ohm pull-high resistor of Port 6 individual pin is

connected or not.

1: Enable the pull-high function.

0: Disable the pull-high function.

Product Specification (V1.0) 03.22.2006 •••• 19

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EM78612

Universal Serial Bus Microcontroller

IOCD (Port 7 Pull-High Control Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

- - - - PH73 PH72 PH71 PH70

IOCD [0~3] Select whether the 132K Ohm pull-high resistor of Port 7 individual pin is

connected or not.

1: Enable the pull-high function.

0: Disable the pull-high function.

IOCE (Special Function Control Register) Default Value: (0B_1111_0000)

7 6 5 4 3 2 1 0

/Dual clock /WUE WTE RUN 0 0 0 0

IOCE [0~3] Undefined register. The default value is zero.

IOCE [4] Run bit. This bit can be cleared by the firmware and set during power-on,

or by the hardware at the falling edge of wake-up signal. When this bit is
cleared, the clock system is disabled and the MCU enters into power
down mode. At the transition of wake-up signal from high to low, this bit is
set to enable the clock system.

1: Run mode. The EM78612 is working normally.

0: Sleep mode. The EM78612 is in power down mode.

IOCE [5] WatchDog Timer enable bit. The bit disable/enables the WatchDog

Timer.

1: Enable WDT.

0: Disable WDT.

NOTE

If the Code Option WTC bit is "0,” WDT is always disabled.

IOCE [6] Enable the wake-up function as triggered by port-change. This bit is set

by UDC.

1: Disable the wake-up function.

0: Enable the wake-up function.

IOCE [7] Dual clock Control bit. This bit is used to select the frequency of system

clock. When this bit is cleared, the MCU will run on very low frequency
save power and the UDC will stop working.

1: Selects EM78612 to run on normal frequency.

0: Selects to run on slow frequency.

20 •••• Product Specification(V1.0) 03.22.2006

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Universal Serial Bus Microcontroller

IOCF (Interrupt Mask Register) Default Value: (0B_0000_0000)

7 6 5 4 3 2 1 0

EM78612

- -

Port 5 State

Change_IE

USB Host

Resume_1E

USB

Reset_IE

USB

Suspend_IE

EP0_IE TCC_IE

IOCF [0~5] TCC / EP0 / USB Suspend / USB Reset / USB Host Resume / Port 5

State Change enable bits. These eight bits respectively control the
function of TCC interrupt, EP0 interrupt, USB Suspend interrupt, USB
Reset interrupt, USB Host Resume interrupt, Port5 State Change
interrupt, Individual interrupt is enabled by setting its associated control
bit in the IOCF to "1".

1: Enable Interrupt.

0: Disable Interrupt.

IOCF[6] Default value is zero and do not modify it.

Only when the global interrupt is enabled by the ENI instruction that the individual
interrupt will work. After DISI instruction, any interrupt will not work even if the
respective control bits of IOCF are set to 1.

The USB Host Resume Interrupt works only under Dual clock mode. This is
because when the MCU is under sleep mode, it will be waked up by the UDC Resume
signal automatically.

7.2.2 USB Application FIFOs

For USB Application, EM78612 provides an 8-byte First-In-First-Out (FIFO) buffer for
each endpoint. The buffer cannot be accessed directly. However, a corresponding Data
Byte Pointer register for each endpoint is made available to address the individual byte
of the FIFO buffer. The content of the individual byte will map to a special register.

Product Specification (V1.0) 03.22.2006 •••• 21

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EM78612

Universal Serial Bus Microcontroller

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7.3 I/O Ports

The EM78612 has up to twelve General Purposes I/O pins, which are classifies into two
port groups; Port 6 and Port 7. Each pin has an internal resistor that can be individually
selected by user.

The following describes the important features o EM78612 I/O pins.

7.3.1 Programmable Large Current

Port 7 has two pins; P70 and P71 that can drive large current of up to 30mA. The range
of driving current is from 3mA to 30mA, which is programmable. Use IOC8 [0,1] and
IOC8 [4,5] to control the sink current of P70/P71. The default current is 3mA.

7.3.2 Wakeup by Port Change Function

Each of the GPIO pins in Port 6 and Port 7 can wakeup the MCU through signal change
from input pin. This function is used to wake-up the MCU automatically from sleep
mode. It also supports the remote wake-up function for USB application.

22 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

Any of the Individual pins of Port 6 and Port 7 can be defined to wakeup the MCU by
setting their respective bits, R8 and R9.

7.4 USB Application

EM78612 is specially designed for USB device application and has many powerful
functions that help the firmware to free itself from complex situation in various aspects
of USB application.

7.4.1 Detect PS/2 or USB Mode

When the EM78612 is connected to the bus, the firmware should detect and identify
which type of bus (USB or PS/2) it is connected to. The conditions that influence detect
function are described below:

EM78612

Universal Serial Bus Microcontroller

1. After a Power-on reset, the initial value of IOCA [0,1] is 0b00. Thus the operation

mode is “Detect mode” and the D+ and D- I/O pins are internal pulled high by
200K Ohm to VDD.

2. The firmware checks the state of R5 [0,1]. If the state with which these two bits is

0b00, set the IOCA [0] to “1” to define the “USB mode.” Otherwise, set the IOCA [1]
to “1,” to define “PS/2 mode.”

3. When the operation mode is defined as “USB mode,” the D- I/O pin is internal

pulled high by a 1.5K Ohm resistor to 3.3V, which is output from a built-in
regulator.

4. If the operation mode is in “PS/2 mode,” both of the PS/2 interface I/O pins are

internal pulled high by a 2.2K Ohm resistor to VDD.

NOTE

The firmware should set the operation mode, either in USB mode or PS/2 mode, at the
beginning of program.

An additional mode, “USB Test Mode” is also available. This mode has no load on D+
and D- I/O pins, and can only be used in USB Application case. Therefore, an external

1.5K Ohm resistor is needed to pull up D- IO pin to 3.3V.

Under “PS/2 mode,” both PS/2 pins are programmed to generate an interrupt. After
setting the Port 5 State change to Interrupt Enable bit, the MCU will interrupt while the
state of these two pins changes.

Product Specification (V1.0) 03.22.2006 •••• 23

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EM78612

Universal Serial Bus Microcontroller

7.4.2 USB Device Controller

The USB Device Controller (UDC) built-in in the EM78612 can interpret the USB
Standard Command and response automatically without involving firmware. The
embedded Series Interface Engine (SIE) handles the serialization and deserialization
of actual USB transmission. Thus, a developer can concentrate his efforts more in
perfecting the device actual functions and spend less energy in dealing with USB
transaction.

The UDC handles and decodes most Standard USB commands defined in the USB
Specification Rev1.1. If UDC receives an unsupported command, it will set a flag to
notify MCU the receipt of such command. The Standard Commands that EM78612
supports includes; Clear Feature, Get Configuration, Get Interface, Get Status, Set

Address, Set Configuration, Set Feature, and Set Interface.

Each time UDC receives a USB command, it writes the command into EP0’s FIFO.
Only when it receives unsupported command that the UDC will notify the MCU through
interrupt.

Therefore, EM78612 is very flexible under USB application because the developer can
freely choose the method of decoding the USB command as dictated by different
situation.

7.4.3 Device Address and Endpoints

EM78612 supports one device address, two endpoints, EP0 for control endpoint, and
EP1 for interrupt endpoint. Sending data to USB host in EM78612 is very easy. Just
write data into EP’s FIFO, then set flag, and the UDC will handle the rest. It will then
confirm that the USB host has received the correct data from EM78612.

7.5 Reset

The EM78612 provides three types of reset: (1) Power-on Reset, (2) WatchDog Reset,
and (3) USB Reset.

7.5.1 Power-On Reset

Power-on Reset occurs when the device is attached to power and a reset signal is
initiated. The signal will last until the MCU becomes stable. After a Power-on Reset, the
MCU enters into following predetermined states (see below), and then, it is ready to
execute the program.

A. The program counter is cleared.

B. The TCC timer and WatchDog timer are cleared.

24 •••• Product Specification(V1.0) 03.22.2006

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EM78612

Universal Serial Bus Microcontroller

C. Special registers and Special Control registers are all set to initial value.

The MCU also has a low voltage detector that detects low output power condition.

Whenever the output voltage of the 3.3V regulator decreases to below 2.2V, a reset
signal is set off.

7.5.2 WatchDog Reset

When the WatchDog timer overflows, it causes the WatchDog to reset. After it resets,
the program is executed from the beginning and some registers will be reset. The UDC
however, remains unaffected.

7.5.3 USB Reset

When UDC detects a USB Reset signal on USB Bus, it interrupts the MCU, then
proceed to perform the specified process that follows. After a USB device is attached to
the USB port, it cannot respond to any bus transactions until it receives a USB Reset
signal from the bus.

7.6 Power Saving Mode

The EM78612 provides two options of power saving modes for energy conservation,
i.e., Power Down mode, and Dual Clock mode.

7.6.1 Power Down Mode

The EM78612 enters into Power Down mode by clearing the RUN register (IOCE[4]).
During this mode, the oscillator is turned off and the MCU goes to sleep. It will wake up
when signal from USB host is resumed, or when the WatchDog resets, or the input port
state changes.

If the MCU wakes up when I/O port status changes, the direction of I/O port direction
should be set at input direction, then read the state of port. For example:

// Set the Port 6 to input port

MOV A,@0XFF

IOW PORT6

// Read the state of Port 6

MOV PORT6,PORT6

// Clear the RUN bit

IOR 0X0E

AND A,@0B11101111

IOW 0X0E

Product Specification (V1.0) 03.22.2006 •••• 25

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EM78612

Universal Serial Bus Microcontroller

:
:

7.6.2 Dual Clock Mode

The EM78612 has one internal oscillator for power saving application. Clearing the Bit
IOCE [7] will enable the low frequency oscillator. At the same time, the external
oscillator will be turned off. Then the MCU will run under very low frequency to
conserve power. Four types of frequency are available for selection in setting Bits IOCA
[6, 7].

The USB Host Resume Interrupt can only be used in this mode. If this interrupt is
enabled, the MCU will be interrupted when the USB Host Resume signal is detected on
USB Bus.

7.7 Interrupt

The EM78612 has two interrupt vectors, one is in 0x0001, and the other is in 0x000A.
When an interrupt occurs while the MCU is running, it will jump to the interrupt vector
(0x0001 or 0x000A) and execute the instructions sequentially from interrupt vector. RF
is the interrupt status register that records the interrupt status in the relative flags/bits.

The interrupt condition could be one of the following:

1. TCC Overflow When the Timer Clock / Counter Register (R1) overflows, the

status flag RF[0] will be set to 1. Its interrupt vector is 0X0001.

2. EP0 Interrupt When the UDC successfully received a setup transaction

from host to EndPoint0, the status flag RF[1] will be set to 1. Its interrupt vector is
0X000A.

3. USB Suspend When UDC detects a USB Suspend signal on USB bus, the

status flag RF[2] will be set to 1. Its interrupt vector is 0X000A.

4. USB Reset When the UDC detects a USB Reset signal on USB bus,

the status flag RF[3] will be set to 1. Its interrupt vector is 0X000A.

5. USB Host Resume When UDC detects that the USB bus has left the Suspend

condition, the status flag RF[4] will be set to 1. Its interrupt vector is 0X000A.

6. Port 5 State Change When the input signals in Port 5 changes, the status flag

RF[5] will be set to 1. Its interrupt vector is 0X0001.

IOCF is an interrupt mask register which can be set individually bit by bit. While their
respective bit is written to 0, the hardware interrupt will inhibit, that is, the EM78612 will
not jump to the interrupt vector to execute instructions. But the interrupt status flags still
records the conditions no matter whether the interrupt is masked or not. The interrupt

26 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

status flags must be cleared by firmware before leaving the interrupt service routine
and enabling interrupt.

The global interrupt is enabled by the ENI (RETI) instruction and is disabled by the DISI
instruction.

Interrupt flag. If a bit of RF is asserted, it means the relative interrupt

requested.

The priority of USB, TCC interrupt is USB > TCC.
 The additional hardware process step of the interrupt occurred

including

A

Disable interrupt means reserving next time interrupt



process until the instruction “RETI” executed.

B

Jump to interrupt vector.



C

Push “Accumulator”, “R3” and “R4”. Steps “A”, “B”, and “C”



are executed at the same time.

D

Clear “R3”and“R4”.



E

If the instruction “RETI” is executed, pop “Accumulator”,



“R3” and “R4”.

FReturn to main program and enable interrupt. Step “E” and “F” are
executed at the same time.

8 Absolute Maximum Ratings

Symbol Min Max Unit

Temperature under bias 0 70 ºC
Storage temperature -65 150 ºC
Input voltage -0.5 6.0 V
Output voltage -0.5 6.0 V

Product Specification (V1.0) 03.22.2006 •••• 27

(This specification is subject to change without further notice)

EM78612

high resistor of Port6 or

Differential Input Command Mode Range

Universal Serial Bus Microcontroller

9 DC Electrical Characteristic

(T = 25f, VDD = 5V, VSS = 0V)

Symble Parameter Condition Min Type Max Unit

3.3V Regulator

V
V
V

Rag

ResetL

ResetH

Output voltage of 3.3v Regulator VDD= 5V 3.0 3.3 3.6 V
Low Power Reset detecting low Voltage - V
Low Power Reset detecting high Voltage - V

Ireg 3.3V Regulator driving capacity V3.3 = 3.3V - - 100 mA

MCU Operation

I
V
V

I

I

IL

IHX

ILX

CC1

SB

Input Leakage Current for input pins

VIN= VDD,VSS

- ­Clock Input High Voltage OSCI 2.5 - - V
Clock Input Low Voltage OSCI - - 1.0 V

VDDoperating supply current –
Normal frequency operation mode

Operating supply current 1 –
Power down mode

Freq. = 6MHz - - 10 mA

WDT disabled - - 100

g

h

1

h

GPIO Pins

V
V
V
V

I

I

I

I

IH

IL

IH

IL

OH1

OL1

OH2

OL2

Input High Voltage Port 5 2.0 - - V
Input Low Voltage Port 5 - - 0.8 V
Input High Voltage Port 6 & 7 2.0 - - V
Input Low Voltage Port 6 & 7 - - 0.8 V

V

Output High Voltage
(Port 6 & P72~P73)
Output Low Voltage
(Port 6 )
Output High Voltage
(Port5)
Output Low Voltage
(Port5)

= 2.4V

OH1

V

= 3.3V

REG

V

= 0.4V

OL2

V

= 3.3V

REG

V

= 2.4V

OH2

VDD= 5V

V

= 2.4V

OL2

VDD= 5V

11 mA

11 mA

7 mA

13 mA

The input pin with internal

R

PH

Pull-high resister

pull-

100

K
Port7 is connected to VSS.
The input pin with internal

R

PL

Pull-low resister

pull-low resistor of Port6 is

8

K
connected to VDD.

A

A





Symble Parameter Condition Min Type Max Unit

USB Interface

V

OH

V

OL

V

DI

V

CM

V

SE

Static Output High 2.8 - 3.6 V
Static Output Low - - 0.3 V

USB operation Mode

Differential Input Sensitivity 0.2 - - V

0.8 - 2.5 V

Single Ended Receiver Threshold USB operation Mode 0.8 - 2.0 V

28 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

C

IN

V

RG

R

PH

I

Sink1

I

Sink2

I

Sink3

I

Sink4

Transceiver Capacitance - - 20 pF
Output Voltage of Internal Regulator 3.0 - 3.6 V
Pull-high resister

(D-)

1.5

K

Programmable Large Current

V

= 0.4V,

P70, P71 Output Sink Current

P70, P71 Output Sink Current

P70, P71 Output Sink Current

P70, P71 Output Sink Current

OUT

IOC8[0,1] or IOC8[4,5] = 00
V

= 0.4V,

OUT

IOC8[0,1] or IOC8[4,5] = 01
V

= 0.4V,

OUT

IOC8[0,1] or IOC8[4,5] = 10
V

= 0.4V,

OUT

IOC8[0,1] or IOC8[4,5] = 11

-30% 3 +30% mA

-30% 6 +30% mA

-30% 12 +30% mA

-30% 25 +30% mA

i

Product Specification (V1.0) 03.22.2006 •••• 29

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

10 Application Cricuit

EM78612_CP

P64P60

P61

P62

P63

P70

P72 P73

NA

V3.3

VSS

P65

P66

P67

P71

D+/CLK

D-/DATA

P50

P51

VDD

USB Application

VDDV3.3

R1

1.5k

P51
P50

Note1. IF IOCA = USB mode, MCU D- pin internal
pull-high to V3.3 with 1.5k resistor.

Note2. IF IOCA = USB test mode, it is necessary that
D- pin external pull-high to V3.3 with 1.5k
resistor.

J1

1
2
3
4

USB connector

V3.3

C3

4.7uF

C4

30pF

Note :
A. Place C1 and C2 close to MCU VDD pin.
B. Place Y1, C4 and C5 close to MCU OSCI pin.
C. In USB application, it is necessary to place C3 close to MCU V3.3 pin.
D. Port6 and Port7 are 3.3V level I/O.
E. Port60 is input only and without internal pull-high and pull-low resistor.

OSCI

Y1

6MHz or 12MHz resonator

VDD

OSCO

C5

30pF

10uF

C1

C2

0.1uF

PS/2 Application

J2

P50

P51

Note3. IF IOCA = PS/2 mode, MCU CLK and DATA pin
internal pull-high to VDD with 4.7k resistor.

5
3
1 2

PS/2 connector

6
4

VDD

30 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

EM78612

(Sink

Universal Serial Bus Microcontroller

Appendix

A. Special Register Map

Operation Registers

address name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Default value

0x00 R0 Indirect Addressing Register 0B_0000_0000

0x01 R1(TCC) Timer/Clock Counter 0B_0000_0000

0x02 R2(PC) Program Counter 0B_0000_0000

0x03 R3(STATUS) - - PS0 T P Z DC C 0B_0001_1xxx

0x04 R4(RSR)

- BK0 Select the register(address: 00~3F) in the indirect addressing mode

0B_0xxx_xxxx

0x05 R5(Port5)

0x06 R6(Port6)

0x07 R7(Port7)

0x08

0x09

0x0C RC EP0_W EP0_R EP1_R 0

0x0D RD USB Application FIFO Address Register 0B_0000_0000

0x0E RE USB Application FIFO Data Register 0B_0000_0000

0x0F RF

R8(Port6

Wake-up Pin

Selection)

R9(Port7

Wake-up Pin

Selection)

- - - - - -

P67 P66 P65 P64 P63 P62 P61 P60

- - - - P73 P72 P71 P70

/Wu67 /Wu66 /Wu65 /Wu64 /Wu63 /Wu62 /Wu61 /Wu60

- - - - /Wu73 /Wu72 /Wu71 /Wu70

Device

Resume

-

EP1_IF

Port5 state
change_IF

USB Host

Resume_

IF

USB

Reset_IF

Host

_SUSPEND

USB

Suspend_IF

P51/D-

/DATA

UDC

_Writing

EP0_IF TCC_IF

P50/D+

/CLK

STALL 0B_0000_0000

0B_0000_0000

0B_0000_0000

0B_0000_0000

0B_1111_1111

0B_1111_1111

0B_0000_0000

Control Registers

address name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Default value

CONT RW_E INT TSR2 TSR1 TSR0 PSR2 PSR1 PSR0 0B_0100_0000

0x05 IOC5

Port5 Direction Control Register

0B_0000_0011

0x06 IOC6

0x07 IOC7

IOC8

0x08

Current)

0x09 IOC9

0x0A IOCA

0x0B IOCB

0x0C IOCC

0x0D IOCD

0x0E IOCE

0x0F IOCF

Port6 Direction Control Register

Port7 Direction Control Register

- - Sink[71]_1 Sink[71]_0 Sink[70]_1 Sink[70]_0

Reserved

Dual_Frq.1 Dual_Frq.0

- - - - PS/2 USB

/PL67 /PL66 /PL65 /PL64 /PL63 /PL62 /PL61 /PL60

/PH67 /PH66 /PH65 /PH64 /PH63 /PH62 /PH61 /PH60

- - - - /PH73 /PH72 /PH71 /PH70

/Dual clock /WUE WTE RUN 0 0 0 0

0

EP1_IE

Port5_State_

Change_IE

USB HOST

Resume_IF

USB

Reset_IE

USB

Suspend_IE

EP0_IE TCC_IE

Product Specification (V1.0) 03.22.2006 •••• 31

(This specification is subject to change without further notice)

0B_1111_1111

0B_0000_1111

0B_0000_0000

0B_1100_0000

0B_0000_0000

0B_0000_0000

0B_0000_0000

0B_1111_0000

0B_0000_0000

EM78612

Universal Serial Bus Microcontroller

B. Instruction Set

Each instruction in the instruction set is a 11-bit word divided into an OP code and one
or more operands. All instructions are executed within one single instruction cycle
(consisting of 2 oscillator periods), unless the program counter is changed by-

(a) Executing the instruction "MOV R2,A", "ADD R2,A", "TBL", or any other instructions
that write to R2 (e.g. "SUB R2,A", "BS R2,6", "CLR R2", ⋅⋅⋅⋅).

(b) execute CALL, RET, RETI, RETL, JMP, Conditional skip (JBS, JBC, JZ, JZA, DJZ,
DJZA) which were tested to be true.

Under these cases, the execution takes two instruction cycles.

In addition, the instruction set has the following features:

(1). Every bit of any register can be set, cleared, or tested directly.

(2). The I/O register can be regarded as general register. That is, the same instruction
can operate on I/O register.

The symbol "R" represents a register designator that specifies which one of the registers (including operational
registers and general purpose registers) is to be utilized by the instruction. Bits 6 and 7 in R4 determine the selected
register bank. "b" represents a bit field designator that selects the value for the bit located in the register "R" and
affects operation. "k" represents an 8 or 10-bit constant or literal value.

INSTRUCTION BINARY HEX MNEMONIC OPERATION STATUS AFFECTED

0 0000 0000 0000 0000 NOP No Operation None
0 0000 0000 0001 0001 DAA Decimal Adjust A C
0 0000 0000 0010 0002 CONTW A → CONT None
0 0000 0000 0011 0003 SLEP 0 → WDT, Stop oscillator T,P
0 0000 0000 0100 0004 WDTC 0 → WDT T,P

0 0000 0000 rrrr 000r IOW R A → IOCR None <Note1>
0 0000 0001 0000 0010 ENI Enable Interrupt None
0 0000 0001 0001 0011 DISI Disable Interrupt None
0 0000 0001 0010 0012 RET [Top of Stack] → PC None

0 0000 0001 0011 0013 RETI

0 0000 0001 0100 0014 CONTR CONT → A None

0 0000 0001 rrrr 001r IOR R IOCR → A None <Note1>

0 0000 0010 0000 0020 TBL

0 0000 01rr rrrr 00rr MOV R,A A → R None

[Top of Stack] → PC,

Enable Interrupt

R2+A → R2,

Bits 8~9 of R2 unchanged

None

Z,C,DC

0 0000 1000 0000 0080 CLRA 0 → A Z

0 0000 11rr rrrr 00rr CLR R 0 → R Z
0 0001 00rr rrrr 01rr SUB A,R R-A → A Z,C,DC
0 0001 01rr rrrr 01rr SUB R,A R-A → R Z,C,DC
0 0001 10rr rrrr 01rr DECA R R-1 → A Z

32 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

EM78612

Universal Serial Bus Microcontroller

INSTRUCTION BINARY HEX MNEMONIC OPERATION STATUS AFFECTED

0 0001 11rr rrrr 01rr DEC R R-1 → R Z
0 0010 00rr rrrr 02rr OR A,R A ∨ VR → A Z
0 0010 01rr rrrr 02rr OR R,A A ∨ VR → R Z
0 0010 10rr rrrr 02rr AND A,R A & R → A Z
0 0010 11rr rrrr 02rr AND R,A A & R → R Z
0 0011 00rr rrrr 03rr XOR A,R A ⊕ R → A Z
0 0011 01rr rrrr 03rr XOR R,A A ⊕ R → R Z
0 0011 10rr rrrr 03rr ADD A,R A + R → A Z,C,DC
0 0011 11rr rrrr 03rr ADD R,A A + R → R Z,C,DC
0 0100 00rr rrrr 04rr MOV A,R R → A Z
0 0100 01rr rrrr 04rr MOV R,R R → R Z
0 0100 10rr rrrr 04rr COMA R /R → A Z
0 0100 11rr rrrr 04rr COM R /R → R Z
0 0101 00rr rrrr 05rr INCA R R+1 → A Z
0 0101 01rr rrrr 05rr INC R R+1 → R Z
0 0101 10rr rrrr 05rr DJZA R R-1 → A, skip if zero None
0 0101 11rr rrrr 05rr DJZ R R-1 → R, skip if zero None

0 0110 00rr rrrr 06rr RRCA R

0 0110 01rr rrrr 06rr RRC R

0 0110 10rr rrrr 06rr RLCA R

0 0110 11rr rrrr 06rr RLC R

0 0111 00rr rrrr 07rr SWAPA R

0 0111 01rr rrrr 07rr SWAP R R(0-3) ↔ R(4-7) None
0 0111 10rr rrrr 07rr JZA R R+1 → A, skip if zero None
0 0111 11rr rrrr 07rr JZ R R+1 → R, skip if zero None

R(n) → A(n-1),

R(0) → C, C → A(7)

R(n) → R(n-1),

R(0) → C, C → R(7)

R(n) → A(n+1),

R(7) → C, C → A(0)

R(n) → R(n+1),

R(7) → C, C → R(0)

R(0-3) → A(4-7),

R(4-7) → A(0-3)

C

C

C

C

None

0 100b bbrr rrrr 0xxx BC R,b 0 → R(b) None <Note2>
0 101b bbrr rrrr 0xxx BS R,b 1 → R(b) None
0 110b bbrr rrrr 0xxx JBC R,b if R(b)=0, skip None
0 111b bbrr rrrr 0xxx JBS R,b if R(b)=1, skip None

1 00kk kkkk kkkk 1kkk CALL k

1 01kk kkkk kkkk 1kkk JMP k (Page, k) → PC None
1 1000 kkkk kkkk 18kk MOV A,k k → A None
1 1001 kkkk kkkk 19kk OR A,k A ∨ k → A Z

Product Specification (V1.0) 03.22.2006 •••• 33

(This specification is subject to change without further notice)

PC+1 → [SP],

(Page, k) → PC

None

EM78612

Universal Serial Bus Microcontroller

INSTRUCTION BINARY HEX MNEMONIC OPERATION STATUS AFFECTED

1 1010 kkkk kkkk 1Akk AND A,k A & k → A Z
1 1011 kkkk kkkk 1Bkk XOR A,k A ⊕ k → A Z
1 1100 kkkk kkkk 1Ckk RETL k k → A, [Top of Stack] → PC None
1 1101 kkkk kkkk 1Dkk SUB A,k k-A → A Z,C,DC
1 1111 kkkk kkkk 1Fkk ADD A,k k+A → A Z,C,DC

Note

1 This instruction is applicable to IOCx only.

2 This instruction is not recommended for RE, RF operation.

C. Code Option Register

34 •••• Product Specification(V1.0) 03.22.2006

(This specification is subject to change without further notice)

Universal Serial Bus Microcontroller

EM78612 has one CODE option registers, which are not part of the normal program memory.

The option bits cannot be accessed during normal program execution.

8 7 6 5 4 3 2 1 0

R.S.

Package_1Package_0OST_1 OST_0 Frequenc

Bit 0 (Frequency) : Frequency Selection.

0: The MCU run on 12 MHz

1: The MCU run on 6 MHz

Bit 2~1 (OST_1 ~ OST_0) : Oscillator Start-up Time.

00: 500us

01: 2ms
10: 8ms
11: 16ms

Bit 4~3 (Package_1 ~ Package_0) : Package type selector.

00 : 16 pins

01 : 18 pins

10 : 20 pins

11 : No define

EM78612

y

Bit 5 (R.S.) : Resistor Switch. enable of Transceiver.

0: Disconnect internal USB D- pull high Register

1: Connect internal USB D- pull high Resister

Bit 8~6 :The values are fixed.

Product Specification (V1.0) 03.22.2006 •••• 35

(This specification is subject to change without further notice)