H8SX1663 datasheet(605/1158 Pages) RENESAS

605 / 1158 page

Section 10 16-Bit Timer Pulse Unit (TPU)

Rev.1.00 Jun. 07, 2006 Page 553 of 1102

REJ09B0294-0100

(1) Example of PWM Mode Setting Procedure

Figure 10.20 shows an example of the PWM mode setting procedure.

Select counter clock

PWM mode

Select counter clearing source

Select waveform output level

[1]

[2]

[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 TGR as an output compare

[4] Set the cycle in TGR selected in [2], and set the duty

in the other TGRs.

[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.

Figure 10.20 Example of PWM Mode Setting Procedure

(2) Examples of PWM Mode Operation

Figure 10.21 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 cycle, and the value set in TGRB register as the

duty cycle.

TCNT value

TGRA

H'0000

TIOCA

Time

TGRB

Counter cleared by

TGRA compare match

Figure 10.21 Example of PWM Mode Operation (1)

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