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7906 Datasheet(PDF) 117 Page - Renesas Technology Corp

Part # 7906
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  531 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7906 Datasheet(HTML) 117 Page - Renesas Technology Corp

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TIMER A
7906 Group User’s Manual Rev.2.0
7-14
7.3 Timer mode
Fig. 7.3.3 Example of operation in timer mode (without pulse output and gate functions)
7.3.2 Operation in timer mode
➀ When the count start bit is set to “1,” the counter starts counting of the count source.
➁ When a counter underflow occurs, the reload register’s contents are reloaded, and counting continues.
➂ The timer Ai interrupt request bit is set to “1” at the underflow in ➁. The interrupt request bit remains
set to “1” until the interrupt request is accepted or until the interrupt request bit is cleared to “0” by
software.
Figure 7.3.3 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
Cleared to “0” when interrupt request is
accepted or cleared by software.
Set to “1” by software.
Starts counting.
(1 / fi) ✕ (n+1)
Cleared to “0” by software.
Set to “1” by software.
fi : Frequency of count source
n : Reload register’s contents



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