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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Tel: [phone]
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(Europe)

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Tel:[phone]
Fax:[phone]

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Corporation, Ltd.

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Tel: [phone]
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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)