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EM78860 Datasheet, PDF (1/25 Pages) ELAN Microelectronics Corp – 8-BIT MICRO-CONTROLLER | |||
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EM78860
8-BIT MICRO-CONTROLLER
GENERAL DESCRIPTION
The EM78860 is an 8-bit RISC type microprocessor with low power , high speed CMOS technology .
Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time clock /
counter , internal interrupt , power down mode , LCD driver and tri-state I/O . The EM78860 provides a single
chip solution to design a message display .
FEATURES
CPU
⢠Operating voltage range : 2.5V~5.5V
⢠16Kx13 on chip ROM
⢠2.8Kx8 on chip RAM
⢠Up to 32 bi-directional tri-state I/O ports
⢠8 Level stack for subroutine nesting
⢠8-bit real time clock/counter (TCC)
⢠Two sets of 8 bit counters can be interrupt sources
⢠Selective signal sources and with overflow interrupt
⢠Programmable free running on chip watchdog timer
⢠99.9% single instruction cycle commands
⢠Four modes (internal clock 3.679MHz, external 32.768KHz)
1. Sleep mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn off
2. Idle mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn on
3. Green mode : 3.679MHz clock turn off, CPU and 32.768KHz clock turn on
4. Normal mode : 3.679MHz clock turn on , CPU and 32.768KHz clock turn on
⢠Low battery detector
⢠Input port wake up function
⢠8 interrupt source , 4 external , 3 internal
⢠100 pin QFP or chip
⢠Port key scan function
⢠Port interrupt , pull high and open drain functions
⢠Clock frequency 32.768KHz externally
LCD
⢠LCD operation voltage chosen by software
⢠Common driver pins : 16
⢠Segment driver pins : 60
⢠1/4 bias
⢠1/8,1/16 duty
APPLICATION
1. adjunct units
2. data bank
* This specification are subject to be changed without notice.
6.24.1998 1
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