SH7014 datasheet(270/754 Pages) RENESAS

270 / 754 page

10. Multifunction Timer Pulse Unit (MTU)

Rev.5.00 Sep. 27, 2007 Page 236 of 716

REJ09B0398-0500

Procedure for Setting Buffer Mode (Figure 10.18):

1. Use the timer I/O control register (TIOR) to set the TGR as either an input capture or output

compare register.

2. Use the timer mode register (TMDR) BFA, and BFB bits to set the TGR for buffer mode.

3. Set the CST bit in the TSTR to 1 to start the count operation.

Select TGR function

Buffer mode

Select buffer mode

Start counting

Buffer mode

Figure 10.18 Buffer Operation Setting Procedure

Buffer Operation Examples

⎯when TGR Is an Output Compare Register: Figure 10.19

shows an example of channel 0 set to PWM mode 1, and the TGRA and TGRC registers set for

buffer operation.

The TCNT counter is cleared by a compare-match B, and the output is a 1 upon compare-match A

and 0 output upon compare-match B. Because buffer mode is selected, a compare-match A

changes the output, and the buffer register TGRC value is simultaneously transferred to the

general register TGRA. This operation is repeated with each occurrence of a compare-match A.

See section 10.4.6, PWM Mode, for details on the PWM mode.

SH7014 Datasheet(PDF) 270 Page - Renesas Technology Corp