EM78871数据手册Elan中文资料规格书

描述 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.

特性 Features

CPUOperating voltage range: 2.2V~5.5V(Normal mode), 2.0V~5.5V(Green mode)
32K x 13 on chip Program ROM
4K x 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 pre-scale
COUNTER1: 8-bit counter with 8-bit pre-scale can be an interrupt source
COUNTER2: 8-bit counter with 8-bit pre-scale can be an interrupt source
Watch Dog: Programmable free running on chip watchdog timer 
Four operation modes:
13 interrupt sources, 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)
CIDOperation Voltage 2.7V ~ 5.5V for FSK
Operation Voltage 2.7V ~ 5.5V for DTMF receiver
Compatible with Bell-core 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)
LCDMaximum common driver pins: 16/24
Maximum segment driver pins: 80(SEG0...SEG79)/72(SEG8...SEG79)
Shared COM16 ~ COM23 pins with SEG0 ~ SEG7 pins
1/4 bias for 8, 9 and 16 common mode and 1/5 bias for 24 common mode
1/8, 1/9, 1/16, 1/24 duty
16 Level LCD contrast control (software)
Internal resistor circuit for LCD bias
Internal voltage follower for better display
Programmable Tone Generator
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
Current DA
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)
Call waiting
Operation Voltage 2.6V~ 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
Package132 pin die: EM78871H
128 pin package: (EM78871AQ POVD disable, EM78871BQ POVD enable)