HD64F3039F18 Datasheet, PDF (272/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 8 16-Bit Integrated Timer Unit (ITU)
Figure 8.30 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%.
TCNT value
GRB
Counter cleared by compare match with GRB
GRA
H'0000
Time
TIOCA
TCNT value
GRA
Write to GRA
Write to GRA
a. 0% duty cycle
Counter cleared by compare match with GRA
GRB
H'0000
Time
TIOCA
Write to GRB
Write to GRB
b. 100% duty cycle
Figure 8.30 PWM Mode (Example 2)
Rev.3.00 Mar. 26, 2007 Page 248 of 682
REJ09B0353-0300