SH7032 Datasheet, PDF (295/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 10 16-Bit Integrated Timer Pulse Unit (ITU)
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 PWM Mode
PWM Mode Operation: Figure 10.29 illustrates PWM mode operation. When PWM mode is set,
the TIOCA pin becomes the output pin. Output is 1 when TCNT matches GRA, and 0 when
TCNT matches GRB. 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.
Rev. 7.00 Jan 31, 2006 page 269 of 658
REJ09B0272-0700