SH7020 Datasheet, PDF (275/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

PWM mode
Select counter clock
(1)
Select counter clear source ₍₂₎
Set GRA
(3)
Set GRB
(4)
Select PWM mode
(5)
Start counting
(6)
PWM mode
Figure 10.28 Procedure for Selecting the PWM Mode
PWM Mode Operation: Figure 10.29 illustrates PWM mode operations. When the PWM mode
is set, the TIOCA pin becomes the output pin. Output is 1 when the TCNT matches the GRA, and
0 when the TCNT matches the GRB. The TCNT can be cleared by compare match with either
GRA or GRB. This can be used in both free-running and synchronized operation.
Figure 10.30 shows examples of PWM waveforms output with 0% and 100% duty cycles. A 0%
duty waveform can be obtained by setting the counter clear source to GRB and then setting GRA
to a larger value than GRB. A 100% duty waveform can be obtained by setting the counter clear
source to GRA and then setting GRB to a larger value than GRA.
RENESAS 259