EM78860中文資料義隆電子數(shù)據(jù)手冊PDF規(guī)格書

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