7733 datasheet(150/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–39

6.5 One-shot pulse mode

Fig. 6.5.5 Operation example in one-shot pulse mode (when external trigger selected)

Counting is

stopped.

Counting is started.

FFFF16

000116

Time

Count start

flag

Timer Ai interrupt

request bit

“1”

n = Reload register’s contents

Cleared to “0” when an interrupt request is accepted; otherwise, cleared by software

Set to “1” by software

Counting is started.

Pin TAiIN’s

input signal

“H”

One-shot pulse

output from pin

TAiOUT

“H”

Trigger during

counting

1 / fi ! (n)

g The above is applied when an external trigger (Rising edge of pin TAiIN’s input signal) is selected.

“0”

“L”

“0”

1 / fi ! (n + 1)

When the count start flag = “0,” in other words, when counting is stopped, pin TAiOUT outputs “L” level.

When a trigger occurs during counting, the counter counts the count source (n + 1) times after a new trigger occurs.

fi = Frequency of count source

(f2,f16,f64,f512)

Counting is stopped.

Reloaded

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