M34512M2 Datasheet, PDF (50/80 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
4512 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
CONTROL REGISTERS (continued)
Serial I/O mode register J1
J13
Not used
Serial I/O internal clock dividing ratio
J12
selection bit
J11
Serial I/O port selection bit
J10
Serial I/O synchronous clock selection bit
A-D control register Q1
at reset : 00002
at RAM back-up : state retained
R/W
0
1
This bit has no function, but read/write is enabled.
0
Instruction clock signal divided by 8
1
Instruction clock signal divided by 4
0
Input ports P20, P21, P22 selected
1
Serial I/O ports SCK, SOUT, SIN/input ports P20, P21, P22 selected
0
External clock
1
Internal clock (instruction clock divided by 4 or 8)
at reset : 00002
at RAM back-up : state retained
R/W
Q13 Not used
Q12
Q11 Analog input pin selection bits
Q10
0
This bit has no function, but read/write is enabled.
1
Q12Q11Q10
Selected pins
0 0 0 AIN0
0 0 1 AIN1
0 1 0 AIN2
0 1 1 AIN3
1 0 0 Not available
1 0 1 Not available
1 1 0 Not available
1 1 1 Not available
A-D control register Q2
at reset : 00002
at RAM back-up : state retained
R/W
Q23 A-D operation mode selection bit
0
1
0
Q22 Not used
1
0
Q21 Not used
1
0
Q20 Not used
1
Note: “R” represents read enabled, and “W” represents write enabled.
A-D conversion mode
Comparator mode
This bit has no function, but read/write is enabled.
This bit has no function, but read/write is enabled.
This bit has no function, but read/write is enabled.
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