HD404318 Datasheet, PDF (41/68 Pages) Hitachi Semiconductor – 4-bit HMCS400-series microcomputer

Timer mode register C (TMC: $00D)
Bit
Initial value
Read/Write
Bit name
3
0
W
TMC3
2
0
W
TMC2
1
0
W
TMC1
0
0
W
TMC0
HD404318 Series
TMC3
0
1
Free-Running/Reload
Timer Selection
Free-running timer
Reload timer
TMC2
0
1
TMC1
0
1
0
1
TMC0
0
1
0
1
0
1
0
1
Input Clock Period
2048t_cyc
1024t_cyc
512t_cyc
128t_cyc
32t_cyc
8t_cyc
4t_cyc
2t_cyc
Figure 29 Timer Mode Register C (TMC)
T × (N + 1)
TMC3 = 0
(Free-running
timer)
TMC3 = 1
(Reload timer)
T × 256
T
T × (256 – N)
Notes: T: Input clock period supplied to counter. (The clock source and system clock division ratio are
determined by timer mode register C.)
N: Value of timer write register C. (When N = 255 ($FF), PWM output is fixed low.)
Figure 30 PWM Output Waveform
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