W925E625 Datasheet, PDF (48/75 Pages) Winbond – 8-bit CID MICROCONTROLLER

W925E/C625
Bit:
7
6
5
4
3
2
1
0
-
DTGE HE
LE
L1
L0
H1
H0
Mnemonic: DTMFGR
Address: Bah
L1
L0
H1
H0
x
x
0
0
x
x
0
1
x
x
1
0
x
x
1
1
0
0
x
x
0
1
x
x
1
0
x
x
1
1
x
x
LE: Enable low group frequency output.
HE: Enable high group frequency output.
DTGE: Enable dual tone output to DTMF pin.
SELECTED TONE
1209Hz
1336Hz
1477Hz
1633Hz
697Hz
770Hz
852Hz
941Hz
6.12 FSK Generator
W925E/C625 provides a FSK generator which outputs the FSK signal to the DTMF pin. The FSK
output share with DTMF output pin. It can out FSK signal with 1200Hz baud rate of ITU-T V.23 or
Bellcore 202 signal. A FSK transmit data register (FSKTB) specifies the desired output data. The FSK
Transmit Control Register (FSKTC) can control whether the FSK signal will be output or not. The
relation timing is shown in Figure 6-12.
Enable signal
(FTE)
Latch clock
[FSF]
Data latch Flag
(FDS)
Data
(FSKTB) bit0
Interrupt occur when rising edge
Auto clear
1
0
1
1
0
0
FSK Signal
(DTMF pin)
Hi-Z
1
01
1
833us
Hi-Z
0
Figure 6-12 FSK Modulator
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