Renesas H8S Series Hardware Manual page 413

Example of PWM Mode Setting Procedure: Figure 10-24 shows an example of the PWM mode setting procedure.
Select counter clock
Select counter clearing source
Select waveform output level
Set PWM mode
Examples of PWM Mode Operation: Figure 10-25 shows an example of PWM mode 1 operation.
In this example, TGRA compare match is set as the TCNT clearing source, 0 is set for the TGRA initial output value and
output value, and 1 is set as the TGRB output value.
In this case, the value set in TGRA is used as the period, and the values set in TGRB registers as the duty.
TCNT value
TGRA
TGRB
H'0000
TIOCA
PWM mode
[1]
[2]
[3]
Set TGR [4]
[5]
Start count [6]
<PWM mode>
Figure 10-24 Example of PWM Mode Setting Procedure
Figure 10-25 Example of PWM Mode Operation (1)
[1] Select the counter clock with bits TPSC2 to
TPSC0 in TCR. At the same time, select the
input clock edge with bits CKEG1 and CKEG0 in
TCR.
[2] Use bits CCLR2 to CCLR0 in TCR to select the
TGR to be used as the TCNT clearing source.
[3] Use TIOR to designate the TGR as an output
compare register, and select the initial value and
output value.
[4] Set the cycle in the TGR selected in [2], and set
the duty in the other the TGR.
[5] Select the PWM mode with bits MD3 to MD0 in
TMDR.
[6] Set the CST bit in TSTR to 1 to start the count
operation.
Counter cleared by
TGRA compare match
Time
Rev.6.00 Oct.28.2004 page 385 of 1016
REJ09B0138-0600H