W742E Datasheet, PDF (42/60 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C811
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.
b3
b2
b1
b0
X
X
0
0
High
X
X
0
1
Group X
X
1
0
X
X
1
1
0
0
X
X
Low
0
1
X
X
Group 1
0
X
X
1
1
X
X
Selected Tone
1209 Hz
1336 Hz
1477 Hz
1633 Hz
697 Hz
770 Hz
852 Hz
941 Hz
Note: X means this bit do not care.
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
DTCR
2
1
0
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
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