HD64F2357F20V Datasheet, PDF (415/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

Example of PWM Mode Setting Procedure: Figure 10-24 shows an example of the PWM mode setting procedure.
PWM mode
Select counter clock
[1]
Select counter clearing source [2]
Select waveform output level [3]
Set TGR
[4]
Set PWM mode
[5]
Start count
[6]
[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.
<PWM mode>
Figure 10-24 Example of PWM Mode Setting Procedure
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
Counter cleared by
TGRA compare match
TGRB
H'0000
Time
TIOCA
Figure 10-25 Example of PWM Mode Operation (1)
Rev.6.00 Oct.28.2004 page 385 of 1016
REJ09B0138-0600H