4513_03 Datasheet, PDF (132/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.3 Timers
(5) Timer control register W3
The timer 3 count source selection bits are assigned to bits 0 and 1, the timer 3 count start synchronous
circuit control bit is assigned to bit 2 and the timer 3 control bit is assigned to bit 3.
Set the contents of this register through register A with the TW3A instruction. The TAW3 instruction
can be used to transfer the contents of register W3 to register A.
Table 2.3.5 shows the timer control register W3.
Table 2.3.5 Timer control register W3
Timer control register W3
at reset : 00002 at RAM back-up : state retained
W33 _{Timer 3 control bit}
0 Stop (state retained)
1 Operating
W32 ^{Timer 3 count start synchronous}
0
Count start synchronous circuit not selected
circuit control bit
1 Count start synchronous circuit selected
W31
W30
W31 W30
Count source
0
Timer 3 count source selection ₀
bits
1
0 Timer 2 underflow signal
1 Prescaler output
0 Not available
1 1 Not available
Note: “R” represents read enabled, and “W” represents write enabled.
R/W
(6) Timer control register W4
The timer 4 count source selection bits are assigned to bits 0 and 1, and the timer 4 control bit is
assigned to bit 3.
Set the contents of this register through register A with the TW4A instruction. The TAW4 instruction
can be used to transfer the contents of register W4 to register A.
Table 2.3.6 shows the timer control register W4.
Table 2.3.6 Timer control register W4
Timer control register W4
at reset : 00002 at RAM back-up : state retained R/W
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
W41 W40
Count source
0
Timer 4 count source selection ₀
bits
1
0 Timer 3 underflow signal
1 Prescaler output
0 CNTR1 input
1 1 Not available
Note: “R” represents read enabled, and “W” represents write enabled.
4513/4514 Group User’s Manual
2-29