7906 datasheet(119/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-16

(2)

Pulse output function

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

5616 to 5816, 5A16, DA16) to “1.” When this function is selected, the TAjOUT pin is forcibly set for the

pulse output pin regardless of the corresponding bits of the port P2 and port P6 direction registers.

The TAjOUT pin outputs a pulse of which polarity is inverted each time a counter underflow occurs.

When the count start bit (addresses 4016, 4116) is “0” (count stopped), the TAjOUT pin outputs “L” level.

Figure 7.3.5 shows an example of operation with the pulse output function selected.

7.3 Timer mode

Fig. 7.3.5 Example of operation with pulse output function selected

FFFF16

000016

Time

Count start bit

Timer Aj interrupt

request bit

Cleared to “0” when interrupt request is accepted or cleared by software.

Set to “1” by software.

Starts counting.

Pulse output from

TAjOUT pin

Set to “1” by software.

Cleared to “0” by software.

Starts counting.

Restarts

counting.

n : Reload register’s contents

7906 Datasheet(PDF) 119 Page - Renesas Technology Corp