Hitachi H8/3032 Series Hardware Manual page 243

Example of Reset-Synchronized PWM Mode: Figure 8-32 shows an example of operation in
reset-synchronized PWM mode. TCNT3 operates as an up-counter in this mode. TCNT4 operates
independently, detached from GRA4 and GRB4. When TCNT3 matches GRA3, TCNT3 is
cleared and resumes counting from H'0000. The PWM outputs toggle at compare match with
GRB3, GRA4, GRB4, and TCNT3 respectively, and all toggle when the counter is cleared.
For the settings and operation when reset-synchronized PWM mode and buffer mode are both
selected, see section 8.4.8, Buffering.
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TCNT3 value
GRA3
GRB3
GRA4
GRB4
H'0000
TIOCA
3
TIOCB
3
TIOCA
4
TOCXA
4
TIOCB
4
TOCXB
4
Figure 8-32 Operation in Reset-Synchronized PWM Mode (Example)
(when OLS3 = OLS4 = 1)
Counter cleared at compare match with GRA3
228
Time