HD404639R Datasheet, PDF (71/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

HD404639R Series
• Timer mode register C1 (TMC1: $00D): Four-bit write-only register that selects the free-
running/reload timer function, input clock source, and the prescaler division ratio as shown in figure 52.
It is reset to $0 by MCU reset.
Writing to this register is valid from the second instruction execution cycle after the execution of the
previous timer mode register C1 write instruction. Setting timer C’s initialization by writing to timer
write register C (TWCL: $00E, TWCU: $00F) must be done after a mode change becomes valid.
Timer mode register C1 (TMC1: $00D)
Bit
Initial value
Read/Write
Bit name
3
0
W
TMC13
2
0
W
TMC12
1
0
W
TMC11
0
0
W
TMC10
TMC13
0
1
Free-running/reload timer selection
Free-running timer
Reload timer
TMC12 TMC11 TMC10
0
0
0
1
1
0
1
1
0
0
1
1
0
1
Input clock period
2048t_cyc
1024t_cyc
512t_cyc
128t_cyc
32t_cyc
8t_cyc
4t_cyc
2t_cyc
Figure 52 Timer Mode Register C1 (TMC1)
• Timer mode register C2 (TMC2: $014): Three-bit read/write register that selects the timer C output
mode as shown in figure 53. It is reset to $0 by MCU reset.
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