Explanation Of The Circuit; Main Cpu - Sony IT-M708 Operation Manual

6. Explanation of the Circuit

6 -1 MAIN CPU

CPU μPD78076is used for main control of this equipment
Specifications
1 FREQUEN
CY
2 MEMORY
3 TIMER
4 SIO
5 PIO
6 MISC
Outline of CPU peripheral circuit
4.5MHz
ROM 60KBytes
RAM 2Kbytes
16bit TIMER x 1CH
8bit TIMER x 4CH
CSIO x 3CH
80 PORTS
A/D CONVERTER
x 8CH
BUZZER OUTPUT
SUB CLOCK X'TAL
BACK UP
EXTERNAL MEMORY
BELL OUTPUT
INTERCOM CARRIER
DATA CARRIER
TIMER INTERRUPT
EEPROM I/F
SUB CPU I/F
SEE PORT MAP
IN USE VOLTAGE DETECT
KEY TOUCH TONE
32.768KHz FOR CLOCK BACK UP
9V BATTERY(006P)
64k bit EEPROM 24LC64(IT-M804)
8K bit EEPROM 24LC08B(IT-M704)
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