SH7101 datasheet(194/560 Pages) RENESAS

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Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 160 of 522

REJ09B0069-0100

When compare match is selected as the TCNT clearing source, the TCNT counter for the relevant

channel performs periodic count operation. The TGR register for setting the period is designated

as an output compare register, and counter clearing by compare match is selected by means of bits

CCLR0 to CCLR2 in TCR. After the settings have been made, TCNT starts up-count operation as

a periodic counter when the corresponding bit in TSTR is set to 1. When the count value matches

the value in TGR, the TGF bit in TSR is set to 1 and TCNT is cleared to H'0000.

If the value of the corresponding TGIE bit in TIER is 1 at this point, the TPU requests an interrupt.

After a compare match, TCNT starts counting up again from H'0000.

Figure 8.5 illustrates periodic counter operation.

TCNT value

TGR

H'0000

CST bit

TGF

Time

Counter cleared by TGR

compare match

Flag cleared by software

Figure 8.5 Periodic Counter Operation

Waveform Output by Compare Match

The MTU can perform 0, 1, or toggle output from the corresponding output pin using compare

match.

Example of Setting Procedure for Waveform Output by Compare Match: Figure 8.6 shows

an example of the setting procedure for waveform output by compare match

SH7101 Datasheet(PDF) 194 Page - Renesas Technology Corp