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TIMER A

7721 Group User’s Manual

8–27

8.4 Event counter mode

qQuadruple processing

Countup is performed at all rising and falling edges input to the TA4OUT and TA4IN pins when the

phase has the relationship that the TA4IN pin’s input signal level goes from “L” to “H” while the

TA4OUT pin’s input signal is at “H” level.

Countdown is performed at all rising and falling edges input to the TA4OUT and TA4IN pins when

the phase has the relationship that the TA4IN pin’s input signal level goes from “H” to “L” while the

TA4OUT pin’s input signal is at “H” level. (Refer to “Figure 8.4.8.”)

Table 8.4.3 lists the relationship between the input signals to the TA4OUT and TA4IN pins and count

operation when the quadruple processing is selected.

Table 8.4.3 Relationship between input signals to TA4OUT

and TA4IN pins and count operation when

quadruple processing is selected

Fig. 8.4.8 Quadruple processing

TA4OUT

TA4IN

Counted up at all edges

–1

Counted up at all edges

Counted down at all edges

Input signal to TA4OUT pin Input signal to TA4IN pin

“H” level

“L” level

Rising edge

Falling edge

“H” level

“L” level

Rising edge

Falling edge

Rising edge

Falling edge

“L” level

“H” level

Falling edge

Rising edge

“H” level

“L” level

Up-count

Down-count

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