W925EP01 Datasheet, PDF (30/108 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925EP01/ W925EP01FG
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, while exist of the DTMF is accepted. ESt changes to low state to stop and reset
the counter.
DTMF ABSENT TIME REGISTER
(initial=19H)
Bit:
7
6
5
4
3
2
1
0
DAT7 DAT6 DAT5 DAT4 DAT3 DAT2 DAT1 DAT0
Mnemonic: DTMFAT
Address: B7h
The clock period of guard-time timer is 0.8582mS. The default DTMF absent time is 21.45mS.
DAT7-0: The pre-set data register for counting DTMF absent time. When DTMF is absent (ESt, high
to low), the guard timer starts to up-count from 00H. As the guard timer is equal to the value
of DTMFAT, the finish of DTMF is recognized. ESt changes to low state to stop and reset the
counter.
INTERRUPT PRIORITY
(initial=00H)
Bit:
7
6
5
4
3
2
1
0
-
PS1
-
PS0 PT1 PX1 PT0 PX0
Mnemonic: IP
IP.7: This bit is un-implemented and will read high.
Address: B8h
PS1: This bit defines the Serial port1 interrupt priority. PS1 = 1 sets it to higher priority level.
PS0: This bit defines the Serial port0 interrupt priority. PS0 = 1 sets it to higher priority level.
PT1: This bit defines the Timer 1 interrupt priority. PT1 = 1 sets it to higher priority level.
PX1: This bit defines the External interrupt 1 priority. PX1 = 1 sets it to higher priority level.
PT0: This bit defines the Timer 0 interrupt priority. PT0 = 1 sets it to higher priority level.
PX0: This bit defines the External interrupt 0 priority. PX0 = 1 sets it to higher priority level.
DTMF AND CAS GENERATOR REGISTER
(initial=00H)
Bit:
7
6
5
4
3
2
1
0
CASGE DTGE HE
LE
L1
L0
H1
H0
Mnemonic: DTMFG
Address: BAh
CASGE: Enable CAS tone output to DTMF pin.
DTGE: Enable dual tone output to DTMF pin.
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