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• Example of PWM Mode Setting Procedure
Figure 12.24 shows an example of the PWM mode setting procedure.
PWM mode
Select counter clock
Select counter clearing source
Select waveform output level
Set PWM mode
Start counting
<PWM mode>
Figure 12.24 Example of PWM Mode Setting Procedure
• Examples of PWM Mode Operation
Figure 12.25 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 value set in TGRB as the duty.
TCNT value
TGRA
TGRB
H'0000
TIOCA
Rev. 1.00, 09/03, page 340 of 704
[1]
[2]
[3]
Set TGR
[4]
[5]
[6]
Figure 12.25 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 period in the TGR selected in [2], and set
the duty in the other 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
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