EM78808
8-bit Micro-controller
I.General Description
The EM78808 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, data
ROM, programmable real time clock/counter, external/internal interrupt, power down mode, LCD driver, FSK
decoder, Call waiting decoder, Energy Detector (DED) , DTMF receiver, Programming Tone generator,
build-in KEY TONE clock generation, Comparator and tri-state I/O. The EM78808 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
•256K×8
on chip data ROM (2.5V ~ 5.5V for main clock 3.5826MHz)
•8K×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)
•An
OP inside (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
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* This specification is subject to change without notice.
4
8/1/2004 (V3.1)
EMC [ ELAN MICROELECTRONICS CORP ]
