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7477 Datasheet(PDF) 87 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  354 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 87 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
1-70
HARDWARE
1.12 Timers
OF
OF
OF
T
RL
RL
RL
FF16
(n-1)16
A
A
A
A
A
A
A
A
A
A
A
A
B
A
A
A
to B
Timer 1 interrupt
enable bit
Count source
(CNTR0 pin)
Count period
Count period
T(s) = 1
÷ count source frequency ! (the timer initial value + 1)
Event counter mode operation example
• OF: Overflow
• RL: Reload
• n: Timer initial value
Timer 1 count stop bit
Down count
Timer 1 interrupt
request bit
“1” is written
“0” is written
Count stop
Count restart
A : • Clearing by writing “0” to the Timer 1 and CNTR interrupt request bits.
• Clearing by accepting the Timer 1 and CNTR interrupt requests when the timer 1 and
CNTR interrupt enable bits are “1.”
Time
CNTR interrupt
enable bit
CNTR interrupt
request bit
CNTR edge
selection bit
In this example, the CNTR interrupt request occurs at rising edge of the count source.
In this example, each CNTR interrupt request does not occur during executing the CNTR interrupt processing routine.
Fig. 1.12.4 Example of event counter mode operation



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