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7477 датащи(PDF) 85 Page - Renesas Technology Corp

номер детали 7477
подробное описание детали  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  361 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 датащи(HTML) 85 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
1-78
HARDWARE
1.12 Timers
Fig.1.12.7 Example of operation of PWM output mode
Timer 3 count
source
Count period
Timer 3 count period
T3(s) = 1
÷ timer 3 count source frequency ! (the timer 3 initial value + 1)
Timer 4 count period
T4(s) = 1
÷ timer 4 count source frequency ! (the timer 4 initial value + 1)
PWM mode operation example
• OF: Overflow
• RL: Reload
• n: Timer 3 initial value
• m: Timer 4 initial value
A : • Clearing by writing “0” to the Timer 3 and Timer 4 interrupt request bits.
• Clearing by accepting the interrupt request when the Timer 3 and Timer 4 interrupt enable bits are “1.”
Timer 4 interrupt
enable bit
Timer 4 interrupt
request bit
Timer 3 interrupt
enable bit
Timer 3 interrupt
request bit
Timer 4 count stop bit
Timer 4 count source
Note: Timer 3 and Timer 4 do not accept count sources in the period from an overflow of the respective
timer till an overflow of the other timer. Because the timer read value changes at the fall of a count
source, the read value in this period remains “FF16”.
(m-1)16
FF16
T4
T1 pin
Time
FF16
T3
T3
T4
OF
OF
A
A
A
A
A
B
C
RL
RL
RL
(n-1)16
OF
OF
OF
B '
B "
C '
B '
B "
C '
RL
RL
(Note)
(Note)
(Note)
(Note)
To B
To B
To B
“1” is written
“0” is written
Time
Count stop
Count restart
To C
To C
"
'
'
PWM output
mode selected
Setting to
output port



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