EM78910/910A
8-bit Micro-controller
I.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.
II. 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)
Set code option bit0(MCLK) : 0/1 ! 3.579MHz/1.79MHz
Mode
Sleep mode
Idle mode
Green mode
CPU status
Turn off
Turn off
Turn on
Turn on
Main clock
Turn off
Turn off
Turn off
Turn on
32.768kHz clock status
Turn off
Turn on
Turn on
Turn on
Normal mode
•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)
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* This specification are subject to be changed without notice.
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2001/01/12
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ELAN [ ELAN MICROELECTRONICS CORP ]
