SH7041A datasheet(384/923 Pages) RENESAS

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Phase Count Mode 4: Figure 12.33 shows an example of phase counting mode 4 operation. Table

12.12 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 12.33 Phase Counting Mode 4 Operation

Table 12.12 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 12.34 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,

and the TGR0B and TGR0D registers are employed for buffer operation. The channel 1 counter

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