HD6473032F Datasheet, PDF (248/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

Figure 8-36 shows examples of waveforms with 0% and 100% duty cycles (in one phase) in
complementary PWM mode. In this example the outputs change at compare match with GRB3, so
waveforms with duty cycles of 0% or 100% can be output by setting GRB3 to a value larger than
GRA3. The duty cycle can be changed easily during operation by use of the buffer registers. For
further information see section 8.4.8, Buffering.
TCNT3 and
TCNT4 values
GRA3
GRB3
H'0000
TIOCA3
TIOCB3
TCNT3 and
TCNT4 values
GRA3
0% duty cycle
a. 0% duty cycle
Time
GRB3
H'0000
TIOCA3
TIOCB3
100% duty cycle
b. 100% duty cycle
Figure 8-36 Operation in Complementary PWM Mode (Example 2)
(when OLS3 = OLS4 = 1)
233
Time