W742C813 Datasheet, PDF (39/56 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C813
5.23.1 DTMF Register
DTMF register is organized as 4-bit binary register. By controlling the DTMF register, one tone of the
low/high group can be selected. The MOV DTMF,R instruction can specify the wanted tones. The bit
descriptions are as follows:
3
2
1
0
DTMF W
W
W
W
Note: W means write only.
High
Group
Low
Group
b3
b2
b1
b0
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
Note: X means this bit do not care.
Selected Tone
1209 Hz
1336 Hz
1477 Hz
1633 Hz
697 Hz
770 Hz
852 Hz
941 Hz
5.23.2 Dual Tone Control Register (DTCR)
Dual tone control register is organized as 4-bit binary register. The output of the dual or single tone will
be controlled by this register. The MOV DTCR,#I instruction can specify the wanted status. The bit
descriptions are as follows:
3
2
1
0
DTCR
W
W
W
Note: W means write only.
Bit 0 = 1 Low group tone output is enabled.
Bit 1 = 1 High group tone output is enabled.
Bit 2 = 1 DTMF output is enabled. When Bit 2 is reset to 0, the DTMF output pin will be Hi-Z state.
Bit 3 is reserved.
5.24 MFP Output Pin (MFP)
The MFP output pin can select the output of the Timer 1 clock or the modulation frequency; the output
of the pin is determined by mode register 1 (MR1). The organization of MR1 is shown in Figure 5-7.
When bit 2 of MR1 is reset to "0," the MFP output can deliver a modulation output in any combination
of one signal from among DC, 4096 Hz, 2048 Hz, and one or more signals from among 128 Hz, 64 Hz,
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Publication Release Date: December 2000
Revision A1