E202075_HD404889 Datasheet, PDF (89/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
(1) Toggle output waveform (timer B, timer C)
Free-running timer
256 clock periods 256 clock periods
Reload timer
(256 – N)
clock periods
(256 – N)
clock periods
(2) PWM output waveform (timer B, timer C)
T × (N + 1)
TMB13 = 0
(free-running timer)
TMB13 = 1
(reload timer)
T × 256
T
T × (256 – N)
Notes:
T: Counter input clock period
( ) The clock input source and division ratio are controlled by
timer mode register B1 and timer mode register C1.
N: Value in timer write register B or timer write register C
When N = 255 (= $FF), PWM output is always fixed at the timer low level.)
Figure 38 Timer Output Waveforms
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