EM78468
8-BIT Microcontroller
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℃)
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Operation speed: DC ~ 10MHz clock input.
Dual clock operation
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High frequency oscillator can select among Crystal, RC, or PLL (phase lock
loop)
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Low frequency oscillator can select between Crystal or RC mode
Totally 272 bytes SRAM
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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
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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
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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.
Product Specification (V1.1) 04.11.2005
• 1
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
