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7721 Datasheet(PDF) 133 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) 133 Page - Renesas Technology Corp

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TIMER A
7721 Group User’s Manual
8–14
8.3 Timer mode
8.3.3 Operation in timer mode
Œ When the count start bit is set to “1,” the counter starts counting of the count source.
 When a counter underflow occurs, the reload register’s contents are reloaded, and counting continues.
Ž The timer Ai interrupt request bit is set to “1” at the underflow in . The interrupt request bit remains
set to “1” until the interrupt request is accepted or the interrupt request bit is cleared to “0” by software.
Figure 8.3.4 shows an example of operation in the timer mode.
Stops counting.
Restarts counting.
FFFF16
n
000016
Time
Count start bit
Timer Ai 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.
1 / fi ! (n+1)
fi = frequency of count source
(f2, f16, f64, f512)
Cleared to “0” by software.
Set to “1” by software.
Fig. 8.3.4 Example of operation in timer mode (without pulse output and gate functions)



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