Hitachi H8/3032 Series Hardware Manual page 239

Examples of PWM Mode: Figure 8-29 shows examples of operation in PWM mode. The PWM
waveform is output from the TIOCA pin. The output goes to 1 at compare match with GRA, and
to 0 at compare match with GRB.
In the examples shown, TCNT is cleared by compare match with GRA or GRB. Synchronized
operation and free-running counting are also possible.
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TCNT value
GRA
GRB
H'0000
TIOCA
a. Counter cleared by GRA
TCNT value
GRB
GRA
H'0000
TIOCA
b. Counter cleared by GRB
Figure 8-29 PWM Mode (Example 1)
Counter cleared by compare match with GRA
Counter cleared by compare match with GRB
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Time
Time