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TIMER A

7733 Group User’s Manual

6–29

6.4 Event counter mode

s Normal processing

Countup is performed at the rising edges of pin TAkIN (k = 2 and 3) if the phase relationship is such

that pin TAkIN’s input signal level changes from “L” to “H” while pin TAkOUT’s input signal level is

“H.”

Countdown is performed at the falling edges of pin TAkIN if the phase relationship is such that pin

TAkIN’s input signal level changes from “H” to “L” while pin TAkOUT’s input signal level is “H.” (Refer

to Figure 6.4.9.)

Fig. 6.4.9 Normal processing

s Quadruple processing

Countup is performed at the rising and falling edges of pins TAIOUT (l = 3 and 4) and TAIIN if the

phase relationship is such that pin TAIIN’s input signal level changes from “L” to “H” while pin

TAIOUT’s input signal level is “H.”

Countdown is performed at the rising and falling edges of pins TAIOUT and TAIIN if the phase

relationship is such that pin TAIIN’s input signal level changes from “H” to “L” while pin TAIOUT’s

input signal level is “H.” (Refer to Figure 6.4.10.)

Table 6.4.3 lists input signals of pins TAIOUT and TAIIN when the quadruple processing is selected.

Fig. 6.4.10 Quadruple processing

TAlOUT

TAlIN

(l = 3, 4)

“H”

“L”

Counted up at all edges

–1

Counted down at all edges

Counted up at all edges

Counted down at all edges

TAkOUT

TAkIN

(k = 2, 3)

“H”

“L”

–1

Counted

down

“L”

Counted

down

Counted

down

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