H8SSLASH2224 datasheet(508/1071 Pages) RENESAS

508 / 1071 page

Section 11 16-Bit Timer Pulse Unit (TPU)

Rev. 5.00 Aug 08, 2006 page 422 of 982

REJ09B0054-0500

Phase Counting Mode Application Example: Figure 11.30 shows an example in which phase

counting mode is designated for channel 1, and channel 1 is coupled with channel 0 to input servo

motor 2-phase encoder pulses in order to detect the 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 cycle and

position control cycle. 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 detection of the pulse width of 2-phase encoder 4-multiplication pulses is performed.

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

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

values for the control cycles are stored.

This procedure enables accurate position/speed detection to be achieved.

TCNT_1

TCNT_0

Channel 1

TGRA_1

(speed cycle capture)

TGRA_0

(speed control cycle)

TGRB_1

(position cycle capture)

TGRC_0

(position control cycle)

TGRB_0 (pulse width capture)

TGRD_0 (buffer operation)

Channel 0

TCLKA

TCLKB

Edge

detection

circuit

Figure 11.30 Phase Counting Mode Application Example

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