SH7014 datasheet(279/754 Pages) RENESAS

279 / 754 page

10. Multifunction Timer Pulse Unit (MTU)

Rev.5.00 Sep. 27, 2007 Page 245 of 716

REJ09B0398-0500

The TSR register TCFD bit is a count direction flag. Read the TCFD flag to confirm whether the

TCNT is incrementing or decrementing.

Table 10.8 shows the correspondence between channels and external clock pins.

Table 10.8

Phase Counting Mode Clock Input Pins

Channel

A Phase Input Pin

B Phase Input Pin

TCLKA

TCLKB

TCLKC

TCLKD

Procedure for Selecting the Phase Counting Mode (Figure 10.28):

1. Set the MD3 to MD0 bits of the timer mode register (TMDR) to select the phase counting

mode.

2. Set the CST bit of the timer start register (TSTR) to 1 to start the count.

Phase counting mode

Select phase counting mode

Start counting

Phase counting mode

Figure 10.28 Procedure for Selecting the Phase Counting Mode

Phase Counting Operation Examples: The phase counting mode uses the phase difference

between two external clocks to increment/decrement the TCNT counter. There are 4 modes,

depending on the count conditions.

Phase Counting Mode 1: Figure 10.29 shows an example of phase counting mode 1 operation.

Table 10.9 lists the up counting and down counting conditions for the TCNT.

SH7014 Datasheet(PDF) 279 Page - Renesas Technology Corp