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EM78871

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

EM78871

8-bit Micro-controller

I.General Description

The EM78871 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, program ROM, programmable real time

clock/counter, external/internal interrupt, power down mode, LCD driver, FSK decoder, Call waiting decoder, DTMF

receiver, Programming Tone generator, build-in KEY TONE clock generation, Comparator and tri-state I/O. The

EM78871 provides a single chip solution to design a CID of calling message display.

II.Feature

CPU

•Operating voltage range : 2.2V~5.5V(Normal mode), 2.0V~5.5V(Green mode)

•32K×13 on chip Program ROM

•4K×8 on chip data RAM

•144 byte working register

•Up to 51 bi-directional tri-state I/O ports (32 shared with LCD Segment pins)

•IO with internal Pull high, wake-up and interrupt functions

•STACK: 32 level stack for subroutine nesting

•TCC: 8-bit real time clock/counter (TCC) with 8-bit prescaler

•COUNTER1: 8-bit counter with 8-bit prescaler can be an interrupt source

•COUNTER2: 8-bit counter with 8-bit prescaler can be an interrupt source

•Watch Dog : Programmable free running on chip watchdog timer

•CPU modes:

Mode

CPU status Main clock 32.768kHz clock status

Sleep mode Turn off

Turn off

Turn off

Green mode Turn on

Turn off

Turn on

Normal mode Turn on

Turn on

Turn on

•13 interrupt source , 8 external , 5 internal

•Key Scan : Port key scan function up to 16x4 keys

•Sub-Clock: 32.768KHz crystal

•Main-clock: 3.5862MHz multiplied by 0.25, 0.5, 1 or 3 generated by internal PLL

•Key tone output :4KHz, 2KHz ,1KHz (shared with IO)

•Comparator: 3-channel comparators: internal (16 level) or external reference voltage. (shared with IO)

•Serial Peripheral Interface (SPI): Interrupt flag available for the read buffer full, Programmable baud rates of

communication, Three-wire synchronous communication. (shared with IO)

Current D/A

•Operation Voltage : 2.5V∼5.5V

•7-bit resolution and 3-bit output level control

•Current DA output can drive speaker through a transistor for sound playing. (shared with IO)

Programmable Tone Generators

•Operation Voltage 2.2V∼5.5V

•Programmable Tone1 and Tone2 generators

•Independent single tone generation for Tone1 and Tone2

•Mixed dual tone generation by Tone1 and Tone2 with 2dB difference

•Can be programmed for DTMF tone generation

•Can be programmed for FSK signal (Bell202 or V.23) generation

CID

•Operation Voltage 2.7V∼5.5V for FSK

•Operation Voltage 2.7V∼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 2.6V∼5.5V

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* This specification is subject to be changed without notice. 4

8/23/04 (V1.5)

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