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7477 датащи(PDF) 97 Page - Renesas Technology Corp

номер детали 7477
подробное описание детали  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  354 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 датащи(HTML) 97 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
1-80
HARDWARE
1.12 Timers
1.12.4 Updating of contents of Timer and Timer latch
After data is written to the Timer, the contents of the Timer and the Timer latch are updated.
2 Timer 1 and Timer 2
When data is written to the Timer, this data is set in the Timer and the Timer latch at the same time.
As a result, after data is written to the Timer which is in count operation, the count period becomes
invalid.
Figure 1.12.8 shows an example of updating of the contents of Timer 1, Time 2 and Timer latch.
Fig. 1.12.8 Example of updating of Timer 1, Timer 2 and Timer latch
(n-1)16
FF16
RL
RL
RL
OF
(m-1)16
A
A
A
OF
OF
m16
• OF: Overflow
• RL: Reload
• n: Timer 1 initial value before updating
• m: Timer 1 initial value after updating
Writing “m16” to timer 1
Example of updating of Timer 1
Timer 1 interrupt
request bit
Timer 1 interrupt
enable bit
Time
• Clearing by writing “0” to the Timer 1 interrupt request bit.
• Clearing by accepting the Timer 1 interrupt request when the Timer 1 interrupt enable bit is “1.”
A :
Incorrect count period



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