7477 datasheet(95/354 Pages) RENESAS

95 / 354 page

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

T1 pin

Time

FF16

(n-1)16

B '

B "

C '

B '

B "

C '

(Note)

To B

“1” is written

“0” is written

Time

Count stop

Count restart

To C

PWM output

mode selected

Setting to

output port

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