Trademark Acknowledgments:
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
2005 by ELAN Microelectronics Corporation
All Rights Reserved
Printed in Taiwan
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responsibility concerning the accuracy, adequacy, or completeness of this specification. ELAN Microelectronics makes
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information and material may change to conform to each confirmed order.
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Contents
Product Specification (V1.1) 04.11.2005
iii
Contents
1 GENERAL DESCRIPTION 1
2 FEATURES 1
2.1
CPU 1
2.2
LCD Circuit 2
2.3
Applications 2
3 PIN ASSIGNMENTS 3
3.1
QFP - 64 3
3.2
LQFP - 64 4
3.3
LQFP - 44 5
3.4
QFP - 44 6
4 FUNCTION DESCRIPTION 9
4.1
Operational Registers 10
4.2
Special Purpose Registers 19
4.3
TCC and WDT Pre-scaler 27
4.4
I/O Ports 30
4.5
RESET and Wake-up 31
4.6
Oscillator 36
4.7
Power-on Considerations 38
4.8
Interrupt 40
4.9
LCD Driver 42
4.10
Infrared Remote Control Application / PWM Waveform Generate 48
4.11
Code Options 52
4.12
Instruction Set 53
4.13
Timing Diagram 55
5 ABSOLUTE MAXIMUM RATINGS 56
6 ELECTRICAL CHARACTERISTIC 57
6.1
DC ELECTRICAL CHARACTERISTICS 57
6.2
AC Electrical Characteristics 59
7 Application Circuit 60
APPENDIX A
A.1
Package Types 61
A.2
Package Information 61
APPENDIX B
B.1
ICE 468XA Oscillator circuit (JP 5) 65
B.2
ICE 468XA output pin assignment (JP 3) 67
EM78468
8-BIT Microcontroller
Product Specification (V1.1) 04.11.2005
1
(This specification is subject to change without further notice)
1 GENERAL
DESCRIPTION
This LSI is an 8-bit RISC type microprocessor with high speed CMOS technology and
low power consumption. Integrated onto a single chip are on chip watchdog timer (WDT),
Data RAM, ROM, programmable real time clock counter, internal/external interrupt,
power down mode, LCD driver, infrared transmitter function, and tri-state I/O. The
EM78468 provides a seven option bits to accommodate user's requirements.
2 FEATURES
2.1 CPU
Operating voltage and temperature range:
2.2V ~ 5.5 V. (at 0~+70)
Operation speed: DC ~ 10MHz clock input.
Dual clock operation
High frequency oscillator can select among Crystal, RC, or PLL (phase lock
loop)
Low frequency oscillator can select between Crystal or RC mode
Totally
272
bytes
SRAM
144 bytes general purpose register
128 bytes on chip data RAM
4K*13 bits MASK - ROM
Up to 28 bi-directional tri-state I/O ports
Typically, 12 bi-directional tri-state I/O ports.
16 bi-directional tri-state I/O ports shared with LCD segment output pin.
8-level stack for subroutine nesting
8-bit real time clock/counter (TCC)
One infrared transmitter/PWM generator function
Four sets of 8 bits auto reload timer can be used as interrupt sources
Counter 1: independent down-count timer.
Counter 2, High Pulse Width Timer (HPWT), and Low Pulse Width Timer
(LPWT) shared with IR function.
Programmable free running on chip watchdog timer (WDT). This function can
operate on Normal, Green and Idle mode.
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