General Description

The EM78910/910A is an 8-bit CID (Call Identification) RISC type microprocessor with low power, high speed CMOS technology. This integrated single chip has on_chip watchdog (WDT), RAM, ROM, programmable real time clock/counter, internal interrupt, power down mode, FSK decoder, Call waiting decoder, SDT (Stuttered dial tone) decoder, DTMF generator, MEI (Multiple Extension Internetworking) function, RTF (Request To Flash) function and tri-state I/O. The EM78910/910A provides a single chip solution to design a CID of calling message_display.

Feature

CPU

• Operating voltage range : 2.5V〜5.5V

• 16K × 13 Read Only Memory

• 1.1K× 8 on chip RAM

• Up to 28 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 (Main clock 3.579MHz or 1.79MHz)

• Ring on voltage detector

• Universal Low battery detector

• Input port wake up function

• 9 interrupt source , 4 external , 5 internal

• Port key scan function

• Clock frequency 32.768KHz

• Eight R-option pins

CID

• Bell 202 , V.23 FSK demodulator

• DTMF generator

• Ring detector on chip

CALL WAITING

• Compatible with Bellcore special report SR-TSV-002476

• Call-Waiting (2130Hz plus 2750Hz) alert signal detection

• Good talkdown and talkoff performance

• Sensitivity compensated by adjusting input OP gain

SDT

• Stuttered Dial Tone (350Hz plus 440Hz) signal detection

MEI/RTF

• Compatible with TIA/EIA-777(TIA SP-4078)

• MEI(Multiplex Extension Internetworking) and RTF(Request To Flash) functions

PACKAGE

• 45-pin die form without MEI/RTF (EM78910AH, POVD disable)(EM78910BH, POVD enable)

• 47-pin die form with MEI/RTF (EM78910AAH, POVD disable)(EM78910ABH, POVD enable)

Application

1. Adjunct units

2. Answering machines

3. Feature phones