W925E240 Datasheet, PDF (23/73 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925E/C240
CID POWER CONTROL REGISTER
(initial = 00H)
Bit:
7
6
5
4
3
2
1
0
-
-
-
CIDE
-
FSKE CASE DTMFE
Mnemonic: CIDPCR
Address: B3h
CIDE: Global enable CID function. Low to disable all functions of CID parts.
FSKE: Enable FSK demodulation circuit.
CASE: Enable Dual Tone Alert Signal detection circuit.
DTMFE: Enable DTMF demodulation circuit.
FSK DATA REGISTER
(initial = XXH)
Bit:
7
6
5
4
3
2
1
0
FD7 FD6 FD5 FD4 FD3 FD2 FD1 FD0
Mnemonic: FSKDR
Address: B4h
FD7-0: 8 bits FSK demodulated data.
DTMF DATA REGISTER
(initial = XXH)
Bit:
7
6
5
4
3
2
1
CASH CASL DTMFH DTMFL DD3 DD2 DD1
Mnemonic: DTMFDR
Address: B5h
CASH: Set when Dual Tone Alert Signal high tone is detected.
CASL: Set when Dual Tone Alert Signal low tone is detected.
DTMFH: Set when DTMF high tone is detected.
DTMFL: Set when DTMF low tone is detected.
DD3-0: 4 bits DTMF demodulated data.
0
DD0
DTMF PRESENT TIME REGISTER
(initial = 19H)
Bit:
7
6
5
4
3
2
1
0
DPT7 DPT6 DPT5 DPT4 DPT3 DPT2 DPT1 DPT0
Mnemonic: DTMFPT
Address: B6h
The clock period of guard-time timer is 0.8582mS. The default DTMF present time is 21.45mS.
DPT7-0: The pre-set data register for counting DTMF present time. When DTMF is detected(Est, low
to high), the guard timer starts to up-count from 00H. As the guard timer is equal to the value
of DTMFPT, the exist of the DTMF is accepted. Est changes to low state to stop and reset
the counter.
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Publication Release Date: July 12, 2005
Revision A10