7477 datasheet(98/354 Pages) RENESAS

98 / 354 page

1-81

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.12 Timers

s Timer 3 and Timer 4

q At PWM mode

After data is written to the Timer which is in count operation, the written data is set only in the

Timer latch but not in the Timer. After that, when the Timer overflows, a value resulting from

decrementing 1 from the value of the Timer latch is written in the Timer.

When data is written to the Timer being at a stop, the written data is set in both Timer and Timer

latch.

q In modes other than the PWM mode

The same operation as “Timer 1 and Timer 2” described in the previous item is performed.

Figure 1.12.9 shows an example of updating of the contents of Timer 3, Time 4 and Timer latch in

PWM mode.

Fig. 1.12.9 Example of updating of Timer 3, Timer 4 and Timer latch in PWM mode

(n-1)16

FF16

(m-1)16

(k-1)16

FF16

m16

(h-1)16

• OF: Overflow

• RL: Reload

• n: Timer 3 initial value before updating

• m: Timer 3 initial value after updating

• k: Timer 4 initial value before updating

• h: Timer 4 initial value after updaiting

Writing “m16” to timer 3

Example of updating of Timer at PWM mode

interrupt request bit

interrupt enable bit

Time

• Clearing by writing “0” to the Timer 3 or Timer 4 interrupt request bit.

• Clearing by accepting the Timer 3 and the Timer 4 interrupt request when the Timer 3

and the Timer 4 interrupt enable bit is “1.”

Count of timer 3

Count of timer 4

Time

Writing “h16” to timer 4

A :

Timer 3

Timer 4

Timer 3

Timer 4

Timer 3

interrupt

Timer 4

interrupt

Timer 3

interrupt

Count of timer 3 by rewriting timer value

Count of timer 4 by rewriting timer value

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