EM78911中文資料義隆電子數(shù)據(jù)手冊(cè)PDF規(guī)格書

General Description

The EM78911 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 ,CALL WAITING decoder, DTMF generator and tri-state I/O . The EM78911 provides a single chip solution to design a CID of calling message_display .

Feature

CPU

? Operating voltage range : 2.5V?5.5V

? 16K× 13 on chip ROM

? 2.8K× 8 on chip RAM

? Up to 36 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

? Four modes (internal clock 3.579MHz)

1. Sleep mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn off

2. Idle mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn on

3. Green mode : 3.579MHz clock turn off, CPU and 32.768KHz clock turn on

4. Normal mode : 3.579MHz clock turn on , CPU and 32.768KHz clock turn on

? Ring on voltage detector and low battery detector

? Input port wake up function

? 9 interrupt source , 4 external , 5 internal

? 100 pin QFP or chip

? Port key scan function

? Clock frequency 32.768KHz

? Eight R-option pins

CID

? Operation Volltage 3.5 ?6V for FSK

? Operation Volltage 2.5 ?6V for DTMF

? Bell 202 , V.23 FSK demodulator

? DTMF generator

? Ring detector on chip

CALL WAITING

? Operation Volltage 3.6 ?5.5V

? Compatible with Bellcore special report SR-TSV-002476

? Call-Waiting (2130Hz plus 2750Hz) Alert Signal Detector

? Good talkdown and talkoff performance

? Sensitivity compensated by adjusting input OP gain

LCD

? LCD operation voltage chosen by software

? Common driver pins : 16

? Segment driver pins : 60

? 1/4 bias

Application

1. adjunct units

2. answering machines

3. feature phones