7733 datasheet(128/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–17

(2) Pulse output function

The pulse output function is selected by setting the pulse output function selection bit (bit 2 at

addresses 5616 to 5A16) to “1.” When this function is selected, pin TAiOUT is forcibly set as the pulse

output pin independent of the corresponding bits of the port P5 and port P6 direction registers. And

then, pin TAiOUT outputs the signal of which polarity is inverted each time an underflow occurs.

When the count start flag (address 4016) = “0,” in other words, when counting is stopped, pin TAiOUT

outputs “L” level. Figure 6.3.6 shows an operation example when the pulse output function is selected.

6.3 Timer mode

Fig. 6.3.6 Operation example when pulse output function is selected

Counting is stopped.

Counting is restarted.

FFFF16

000016

Time

Count start flag

Pulse output from

pin TAiOUT

“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.

“0”

Timer Ai interrupt

request bit

“1”

“0”

Set to “1” by software

“1”

“0”

Cleared to “0” by software

7733 Datasheet(PDF) 128 Page - Renesas Technology Corp