H8S2245 datasheet(375/818 Pages) RENESAS

375 / 818 page

Section 9 16-Bit Timer Pulse Unit (TPU)

Rev.3.00 Mar. 26, 2007 Page 333 of 772

REJ09B0355-0300

Example of PWM Mode Setting Procedure

Figure 9.21 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 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.

Figure 9.21 Example of PWM Mode Setting Procedure

Examples of PWM Mode Operation

Figure 9.22 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 output 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.

H8S2245 Datasheet(PDF) 375 Page - Renesas Technology Corp