Specification
Overview
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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.
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Features & Benefits
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CPU
- Operation voltage range: 2.5V~5.5V
- 16K x 13 on chip Electrical One Time Programmable Read Only Memory (OTP-ROM)
- 2.5K x 8 on data 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 operation modes: Sleep mode (CPU and main clock turn off, 32.768KHz clock turn off), IDLE mode (CPU and main clock turn off, 32.768KHz clock turn on), Green mode (main clock turn off, CPU and 32.768KHz clock turn on), Normal mode (main clock turn on , CPU and 32.768KHz clock turn on)
- Ring on voltage detector
- Input port wake up function
- 9 interrupt sources, 4 external, 5 internal
- 100 pin QFP or chip
- Port key scan function
- External Sub-Clock frequency is 32.768KHz
- Eight R-option pins
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CID
- Operation Voltage: 3.5V~6V for FSK
- Operation Voltage: 2.5V~6V for DTMF
- Bell 202, V.23 FSK demodulator
- DTMF generator
- Ring detector on chip
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Call waiting
- Operation Voltage: 3.6V~5.5V
- Compatible with Bell-core special report SR-TSV-002476
- Call-Waiting (2130Hz plus 2750Hz) Alert Signal Detector
- Good talk-down and talk-off performance
- Sensitivity compensated by adjusting input OP gain
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LCD
- LCD operation voltage chosen by software
- Common driver pins: 16
- Segment driver pins: 60
- 1/4 bias
- 1/8,1/16 duty
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Data Sheet
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Download File
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Package
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Download File
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Technical Information
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Website Link
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