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6-7 CALL-ID Circuit
SUB-CPU uPD78082(IC500) is equipped in order to control FSK DECORDER for CALLER-ID on
4 LINES.(only IT-M804)
SUB-CPU communicates with MAIN CPU by serial signal.
1. FSK decoder mode is set by direction of MAIN-CPU.
2. Receiving terminal of FSK Decoder is observed.
3. If FSK Decoder receives effective data, it receives
4. And to make FSK receiving data format and calculates check-sum.
5. If it is effective CALLER-ID data, it is transferred to MAIN-CPU.
6. When CAS tone is detected, it is also notified to MAIN-CPU in the same way.
Transmission rate: 1200bps
CAS TONE frequency: LOW
Data transmitting timing for MAIN-SUB CPU.
2130Hz
High
2750Hz
36
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