M34512M2 Datasheet, PDF (49/80 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)
W13
Timer control register W1
Prescaler control bit
W12 Prescaler dividing ratio selection bit
W11
W10
Timer 1 control bit
Timer 1 count start synchronous circuit
control bit
at reset : 00002
at RAM back-up : 00002
0
Stop (state initialized)
1
Operating
0
Instruction clock divided by 4
1
Instruction clock divided by 16
0
Stop (state retained)
1
Operating
0
Count start synchronous circuit not selected
1
Count start synchronous circuit selected
Timer control register W2
W23 Timer 2 control bit
W22 Not used
W21
W20
Timer 2 count source selection bits
at reset : 00002
at RAM back-up : state retained
0 Stop (state retained)
1 Operating
0
This bit has no function, but read/write is enabled.
1
W21 W20
Count source
0 0 Timer 1 underflow signal
0 1 Prescaler output
1 0 Not available
1 1 16 bit timer (WDT) underflow signal
W33
W32
W31
W30
Timer control register W3
Timer 3 control bit
Timer 3 count start synchronous circuit
control bit
Timer 3 count source selection bits
at reset : 00002
at RAM back-up : state retained
0 Stop (state retained)
1 Operating
0 Count start synchronous circuit not selected
1 Count start synchronous circuit selected
W31 W30
Count source
0 0 Timer 2 underflow signal
0 1 Prescaler output
1 0 Not available
1 1 Not available
Timer control register W4
at reset : 00002
at RAM back-up : state retained
W43 Timer 4 control bit
0 Stop (state retained)
1 Operating
W42 Not used
0
This bit has no function, but read/write is enabled.
1
W41
W40
Timer 4 count source selection bits
W41 W40
0 0 Timer 3 underflow signal
0 1 Prescaler output
1 0 Not available
1 1 Not available
Count source
Note: “R” represents read enabled, and “W” represents write enabled.
R/W
R/W
R/W
R/W
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