EM78P911A
8-bit Micro-controller
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* This specification is subject to change without notice.
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212/19/2005 (V2.1)
I.General Description
The EM78P911A 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, SDT decoder, DTMF generator,
MEI(Multiple Extension Internetworking) and RTF(Request To Flash) functions, and tri-state I/O . The EM78P911A
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 Electrical One Time Programmable Read Only Memory (OTP-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
‧ Universal 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
‧ Minimum access frequency deviation ± 0.5% for U.S. Call waiting spec. (EM78P911A)
SDT
‧ Stuttered Dial Tone (350Hz plus 440Hz) Signal Detect
MEI/RTF
‧Compatible with TIA/EIA-777(TIA SP-4078)
‧MEI(Multiplex Extension Internetworking) and RTF(Request To Flash) functions
