Hitachi H8/3048 Hardware Manual page 366

Single-chip microcomputer
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Example of Reset-Synchronized PWM Mode: Figure 10-32 shows an example of operation in
reset-synchronized PWM mode. TCNT3 operates as an up-counter in this mode. TCNT4 operates
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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 of
TCNT3 with GRB3, GRA4, and GRB4 respectively, and all toggle when the counter is cleared.
TCNT3 value
GRA3
GRB3
GRA4
GRB4
H'0000
TIOCA
3
TIOCB
3
TIOCA
4
TOCXA
4
TIOCB
4
TOCXB
4
Figure 10-32 Operation in Reset-Synchronized PWM Mode (Example)
For the settings and operation when reset-synchronized PWM mode and buffer mode are both
selected, see section 10.4.8, Buffering.
Counter cleared at compare match with GRA3
(when OLS3 = OLS4 = 1)
354
Time

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