SH7101 datasheet(195/486 Pages) RENESAS

195 / 486 page

8. Multi-Function Timer Pulse Unit (MTU)

Rev.2.00 Sep. 27, 2007 Page 161 of 448

REJ09B0394-0200

Table 8.36

Up/Down-Count Conditions in Phase Counting Mode 4

TCLKA (Channel 1)

TCLKC (Channel 2)

TCLKB (Channel 1)

TCLKD (Channel 2)

Operation

High level

Up-count

Low level

Don't care

High level

Down-count

Low level

High level

Don't care

Low level

Legend:

: Rising edge

: Falling edge

Phase Counting Mode Application Example: Figure 8.29 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.

SH7101 Datasheet(PDF) 195 Page - Renesas Technology Corp