SH7101 datasheet(206/560 Pages) RENESAS

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Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 172 of 522

REJ09B0069-0100

Example of PWM Mode Setting Procedure: Figure 8.20 shows an example of the PWM mode

setting procedure.

PWM mode

Select counter clock

Select counter clearing

source

Select waveform

output level

Set TGR

Set PWM mode

Start count

[1]

[2]

[3]

[4]

[5]

[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 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 8.20 Example of PWM Mode Setting Procedure

Examples of PWM Mode Operation: Figure 8.21 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 period, and the values set in the TGRB registers

are used as the duty cycle.

TCNT value

TGRA

H'0000

TIOCA

Time

TGRB

Counter cleared by

TGRA compare match

Figure 8.21 Example of PWM Mode Operation (1)

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