W925E240 Datasheet, PDF (24/73 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925E/C240
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
-
PS1
-
4
3
2
1
0
-
PT1 PX1 PT0 PX0
Mnemonic: IP
Address: B8h
IP.7: This bit is un-implemented and will read high.
PS1: This bit defines the Serial port interrupt priority. PS1 = 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 GENERATOR REGISTER
(initial = 00H)
Bit:
7
6
5
4
3
2
1
0
-
DTGE HE
LE
L1
L0
H1
H0
Mnemonic: DTMFG
Address: BAh
L1 L0 H1 H0
x
x
0
0
x
x
0
1
x
x
1
0
x
x
1
1
Selected tone
1209Hz
1336Hz
1477Hz
1633Hz
0
0
x
x
0
1
x
x
1
0
x
x
1
1
x
x
697Hz
770Hz
852Hz
941Hz
LE: Enable low group frequency output.
HE: Enable high group frequency output.
DTGE: Enable dual tone output to DTMF pin.
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