ml7020mb Oki Semiconductor, ml7020mb Datasheet - Page 14

• Manufacturer Part Number: ml7020mb
• Description: 1200 Bps Modem For Remote Control Systems
• Manufacturer: Oki Semiconductor

FUNCTIONAL DESCRIPTION
Description of Processor Interface
1 Semiconductor
List of Registers
PBG3 to 0/PBR3 to 0
The registers PBG3 to 0 are used for setting the DTMF transmit data.
The registers PBR3 to 0 are used for reading the DTMF receive data.
The output frequency does not change even if the code is changed during transmission.
Table 2 shows the data assignments.
* Data written into the registers other than the register [(A1, A0) = (0,0)] can be read out.
* Immediately after switching ON the power, use the LSI only after clearing the control registers
using the power down mode.
A1
PBG3/
0
0
1
1
0
PBR3
D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
A0
0
1
0
1
0
PBG2/
PBR2
D2
R/W
R/W
R/W
R/W
Table 2 DTMF transmit/receive data assignments
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
W
R
Table 1 List of processor interface registers
PBG1/
SW1 CONT
SW3 CONT
SW5 CONT
PBR1
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
PBG3
PBR3
D3
PBG0/
PBR0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
SW2 CONT
SW4 CONT
MODE2
PBG2
PBR2
D2
CODE
A
B
C
D
1
2
3
4
5
6
7
8
9
0
#
MOD-DT ON
CPTG ON
MODE1
PBG1
PBR1
frequency (Hz)
Lower group
D1
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
CPT800
MODE0
PBG0
PBR0
frequency (Hz)
ATT
Higher group
D0
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
FEDL7020-02
ML7020
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