w925e625 ETC-unknow, w925e625 Datasheet - Page 48

• Manufacturer Part Number: w925e625
• Description: 8-bit Cid Microcontroller
• Manufacturer: ETC-unknow

LE: Enable low group frequency output.
HE: Enable high group frequency output.
DTGE: Enable dual tone output to DTMF pin.
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.
L1
x
x
x
x
0
0
1
1
Enable signal
(FTE)
Latch clock
[FSF]
Data latch Flag
(FDS)
Data
(FSKTB) bit0
FSK Signal
(DTMF pin)
Mnemonic: DTMFGR
Bit:
L0
0
1
0
1
x
x
x
x
7
-
Hi-Z
H1
Interrupt occur when rising edge
DTGE
0
0
1
1
x
x
x
x
1
6
Figure 6-12 FSK Modulator
833us
1
0
HE
- 48 -
5
0
H0
0
1
0
1
x
x
x
x
1
1
LE
4
1
1
L1
0
3
SELECTED TONE
Address: Bah
0
0
L0
1209Hz
1336Hz
1477Hz
1633Hz
2
Hi-Z
697Hz
770Hz
852Hz
941Hz
Auto clear
W925E/C625
H1
1
H0
0