EM78P915
8-bit Micro-controller
I. General Description
The EM78P915 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 detector, current DA
module and tri-state I/O. The EM78P915 provides a single chip solution to design a CID of calling message display.
II. Feature
CPU
Operating voltage: 2.2V~5.5V for normal mode
Main CLK (Hz)
Under
10.74M
0.895M~3.58M
Operating Voltage (min)
2.2V
3.1V
2.2V~5.5V for green mode
32K 13 on chip program ROM
2.5K 8 on chip RAM
Up to 44 bi-directional tri-state I/O ports
8 level stack for subroutine nesting
8-bit real time clock/counter (TCC)
Two independent 8 bits up-counter interrupt.
Selective signal sources and trigger edges , and with overflow interrupt
Programmable free running on chip watchdog timer
99.9
single instruction cycle commands
4 step Normal mode CLK : 0.895 , 1.79 , 3.58 , 10.74 MHz generated by internal PLL.
Four operation modes.
1. Sleep mode: CPU and PLL turn off, 32.768KHz clock turn off
2. Idle mode: CPU and PLL turn off, 32.768KHz clock turn on
3. Green mode: PLL turn off, CPU and 32.768KHz clock turn on
4. Normal mode: PLL turn on, CPU and 32.768KHz clock turn on
Universal Low battery detector
Input port wake up function
9 interrupt source, 6 external, 3 internal
Port key scan function
Clock frequency 32.768KHz
oscillator start to stable time will smaller/equal 0.5 sec
SPI
Serial Peripheral Interface (SPI) : a kind of serial I/O interface
Interrupt flag available for the read buffer full or transmitter buffer empty.
Programmable baud rates of communication
Three-wire synchronous communication.(shared with IO )
CID
Operation Voltage 2.4V 5.5V for FSK
Operation Voltage 2.4V 5.5V for DTMF receiver
Compatible with Bellcore GR-30-CORE (formerly as TR-NWT-000030)
Compatible with British Telecom (BT) SIN227 & SIN242
FSK demodulator for Bell 202 and ITU-T V.23 (formerly as CCITT V.23)
CALL WAITING
Operation Voltage 2.4V 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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* This specification is subject to be changed without notice.
2005/12/21 (V2.0)
EMC [ ELAN MICROELECTRONICS CORP ]
