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| 型號(hào)： | W742E811 |
| 文件頁(yè)數(shù)： | 45/66頁(yè) |
| 文件大?。?/td> | 303K |
| 代理商： | W742E811 |
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Preliminary W742C(E)811
Publication Release Date: May 1999
- 45 -
Revision A1
b3
b2
b1
b0
Selected tone
X
X
0
0
1209 Hz
High
X
X
0
1
1336 Hz
group
X
X
1
0
1477 Hz
X
X
1
1
1633 Hz
0
0
X
X
697 Hz
Low
0
1
X
X
770 Hz
group
1
0
X
X
852 Hz
1
1
X
X
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:
Note: W means write only.
W
W
W
0
1
2
3
DTCR
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, 8 Hz, 4
Hz, 2 Hz, or 1 Hz (the clock source is from 32.768 KHz crystal). The MOV MFP, #I instruction is used
to specify the modulation output combination. The data specified by the 8-bit operand and the MFP
output pin are shown in next page.
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