4513 datasheet(124/210 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-21

4513/4514 Group User’s Manual

Fig. 2.2.5 Timer 1 constant period interrupt setting example

g0 h

Disable Interrupts

Timer 1 interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V1

“0”

!! !

All interrupts disabled (DI instruction)

Timer 1 interrupt occurrence disabled

(TV1A instruction)

Stop Timer Operation

Timer 1 and prescaler are temporarily stopped.

Dividing ratio of prescaler is selected.

Timer control register W1

Timer 1 stop (TW1A instruction)

Prescaler stop

Prescaler divided by 16 selected

Set Timer Value

Timer 1 count time is set. (The formula is shown gA below.)

Timer 1 reload register R1

“5216”

Timer count value 82 set (T1AB instruction)

Clear Interrupt Request

Timer 1 interrupt activated condition is cleared.

Timer 1 interrupt request flag T1F “0”

Timer 1 interrupt activated condition cleared

(SNZT1 instruction)

Note when the interrupt request is cleared

When is executed, considering the skip of the next instruction according to the

interrupt request flag T1F, insert the NOP instruction after the SNZT1 instruction.

Start Timer Operation

Timer 1 and prescaler temporarily stopped are restarted.

Timer control register W1

Timer 1 operation start (TW1A instruction)

Prescaler operation stop

Enable Interrupts

The Timer 1 interrupt which is temporarily disabled is enabled.

Interrupt control register V1

Interrupt enable flag INTE

“1”

Timer 1 interrupt occurrence enabled

(TV1A instruction)

All interrupts enabled (EI instruction)

!! !

Constant period interrupt execution start

gA The prescaler dividing ratio and timer 1 count value to make the interrupt occur every 1 ms are set as follows.

1 ms

≅ (4.0 MHz) ! 3

! 16

! (82+1)

–1

System clock Instruction

clock

Prescaler

dividing

ratio

Timer 1

count

value

“!”: it can be “0” or “1.”

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