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TIMER A

7906 Group User’s Manual Rev.2.0

7-27

Input signal to TAmOUT pin

Countup is performed at the rising edges

input to the TA2IN pin when the TA2IN and

TA2OUT have the relationship that the TA2IN

pin’s input signal goes from “L” to “H” while

the TA2OUT pin’s input signal is at “H” level.

Countdown is performed at the falling edges

input to the TA2IN pin when the TA2IN and

TA2OUT have the relationship that the TA2IN

pin’s input signal goes from “H” to “L” while

the TA2OUT pin’s input signal is “H.” (See

Figure 7.4.7.)

Countup is performed at all rising and fall-

ing edges input to the TAmOUT and TAmIN

pins when the TAmIN and TAmOUT have the

relationship that the TAmIN pin’s input sig-

nal level goes from “L” to “H” while the

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

Countdown is performed at all rising and

falling edges input to the TAmOUT and TAmIN

pins when the TAmIN and TAmOUT have the

relationship that the TAmIN pin’s input sig-

nal level goes from “H” to “L” while the

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

(See Figure 7.4.8.)

Table 7.4.3 lists the input signals on the

TAmOUT and TAmIN pins when the quadruple

processing is selected.

Fig. 7.4.7 Normal processing

Table 7.4.3 TAmOUT and TAmIN pin’s input signals when quadruple processing is selected

“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

Countup

Countdown

Fig. 7.4.8 Quadruple processing

Input signal to TAmIN pin

7.4 Event counter mode

TAmOUT

TAmIN

“H”

“L”

Counted up at all edges.

–1

Counted down at all edges.

Counted up at all edges.

Counted down at all edges.

TA2OUT

TA2IN

“H”

“L”

–1

“L”

Countup

Countdown Countdown

Countdown

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