SH7014 datasheet(283/754 Pages) RENESAS

283 / 754 page

10. Multifunction Timer Pulse Unit (MTU)

Rev.5.00 Sep. 27, 2007 Page 249 of 716

REJ09B0398-0500

Phase Count Mode 4: Figure 10.32 shows an example of phase counting mode 4 operation. Table

10.12 lists the up counting and down counting conditions for the TCNT.

Increment

Decrement

TCLKA (Channel 1)

TCLKC (Channel 2)

TCLKB (Channel 1)

TCLKD (Channel 2)

TCNT value

Time

Figure 10.32 Phase Counting Mode 4 Operation

Table 10.12 Phase Count Mode 4 Up/Down Counting Conditions

TCLKA (Channel 1)

TCLKC (Channel 2)

TCLKB (Channel 1)

TCLKD (Channel 2)

Operation

1 (high level)

Rising edge

Increment

0 (low level)

Falling edge

Rising edge

0 (low level)

Does not count (don't care)

Falling edge

1 (high level)

Falling edge

Decrement

0 (low level)

Rising edge

1 (high level)

Does not count (don't care)

Falling edge

0 (low level)

Phase Counting Mode Application Example: Figure 10.33 shows an example where channel 1

is set to phase counting mode and is teamed with channel 0 to input a two-phase encoder pulse for

a servo motor to accurately detect position and speed.

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

the TCLKA and TCLKB pins.

Channel 0 is set so that the TCNT counter is cleared on a TGR0C register compare-match, and the

TGR0A and TGR0C registers are used with the compare-match function to establish the speed

control and position control periods. The TGR0B register is used with the input capture function,

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