EM78911 Datasheet, PDF (1/37 Pages) ELAN Microelectronics Corp – 8-BIT MICRO-CONTROLLER

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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