HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 281

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

sequence TCNT3, TCNT4, TCNT4, TCNT3 (in this mode, TCNT3 starts out larger than TCNT4).
Figure 10.35 shows examples of PWM waveforms with 0% and 100% duty cycles (in one phase)
in the complementary PWM mode. In this example, the pin output changes upon GRB3 compare
match, so duty cycles of 0% and 100% can be obtained by setting GRB3 to a value larger than
GRA3. Combining buffer operation with the above operation makes it easy to change the duty
while operating. See section 10.4.8, Buffer Operation, for details.
TOCXA4
TOCXB4
TIOCA3
TIOCB3
TIOCA4
TIOCB4
TCNT3, TCNT4 value
GRA3
GRB3
GRA4
GRB4
Figure 10.34 Complementary PWM Mode Operation Example 1
TCNT4
Down-counting starts at compare match
between TCNT3 and GRA3
TCNT3
Up-counting starts at TCNT4 underflow
Time
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