R5F72115D160FPV datasheet(491/1228 Pages) RENESAS

491 / 1228 page

Section 10 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 May. 08, 2008 Page 467 of 1200

REJ09B0344-0200

(3)

Phase Counting Mode Application Example

Figure 10.34 shows an example in which channel 1 is in phase counting mode, and channel 1 is

coupled with channel 0 to input servo motor 2-phase encoder pulses in order to detect position or

speed.

Channel 1 is set to phase counting mode 1, and the encoder pulse A-phase and B-phase are input

to TCLKA and TCLKB.

Channel 0 operates with TCNT counter clearing by TGRC_0 compare match; TGRA_0 and

TGRC_0 are used for the compare match function and are set with the speed control period and

position control period. TGRB_0 is used for input capture, with TGRB_0 and TGRD_0 operating

in buffer mode. The channel 1 counter input clock is designated as the TGRB_0 input capture

source, and the pulse widths of 2-phase encoder 4-multiplication pulses are detected.

TGRA_1 and TGRB_1 for channel 1 are designated for input capture, and channel 0 TGRA_0 and

TGRC_0 compare matches are selected as the input capture source and store the up/down-counter

values for the control periods.

This procedure enables the accurate detection of position and speed.

R5F72115D160FPV Datasheet(PDF) 491 Page - Renesas Technology Corp