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EM78R911

8-bit micro-controller

ELAN Microelectronics 

EM78911

8-bit micro-controller

EM78911

I.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 .

II.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

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