HD64F3028F25 Datasheet, PDF (385/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Figure 9.28 shows examples of the output of PWM waveforms with duty cycles of 0% and 100%.
If the counter is cleared by compare match with GRB, and GRA is set to a higher value than GRB,
the duty cycle is 0%. If the counter is cleared by compare match with GRA, and GRB is set to a
higher value than GRA, the duty cycle is 100%.
16TCNT value
GRB
Counter cleared by compare match B
GRA
H'0000
Time
TIOCA
16TCNT value
GRA
Write to GRA
Write to GRA
a. 0% duty cycle (TOA=0)
Counter cleared by compare match A
GRB
H'0000
Time
TIOCA
Write to GRB
Write to GRB
b. 100% duty cycle (TOA=1)
Figure 9.28 PWM Mode (Example 2)
Rev. 2.00, 09/03, page 353 of 890