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7721 Datasheet(PDF) 135 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 135 Page - Renesas Technology Corp

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TIMER A
7721 Group User’s Manual
8–16
8.3 Timer mode
(2)
Pulse output function
The pulse output function is selected by setting the pulse output function select bit (bit 2 at addresses
5816 to 5A16) 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 P5 direction register. The TAjOUT pin outputs
pulses of which polarity is inverted each time a counter underflow occurs.
When the count start bit (address 4016) is “0” (count stopped), the TAjOUT pin outputs “L” level. Figure
8.3.6 shows an example of operation with the pulse output function selected.
Fig. 8.3.6 Example of operation selecting pulse output function
FFFF16
n
000016
Time
Count start bit
Timer Aj interrupt
request bit
n = Reload register’s contents
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.



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