EM78811中文資料義隆電子數(shù)據(jù)手冊PDF規(guī)格書

GENERAL DESCRIPTION

The EM78811 is an 8-bit CID (Call Identification) 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 , FSK decoder , DTMF generator and tri-state I/O . The EM78811 provides a single chip solution to design a CID of calling message_display .

FEATURES

CPU

? Operating voltage range : 2.5V~5.5V

? 16K X13 on chip ROM

? 2.8K X 8 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 trigger edges , and with overflow interrupt

? Programmable free running on chip watchdog timer

? 99.9 single instruction cycle commands

? Three modes (internal clock 3.679MHz)

1. sleep mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn off

2. Idle mode : CPU and 3.679 MHz 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

? Ring on voltage detector and low battery detector

? Input port wake up function

? 8 interrupt source , 4 external , 4 internal

? 100 QFP or chip

? Port key scan function

? Port interrupt, Pull high and Open drain functions

? Clock frequency 32.768KHz

? Main clock can switch to 1.84MHz by code option

CID

? Operation Volltage 3.5 ~5.5V for FSK

? Operation Volltage 2.5 ~5.5V for DTMF

? Bell 202 , V.23 FSK demodulator

? DTMF generator

? Ring detector on chip

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. answering machines

3. feature phones