4513 datasheet(125/210 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-22

4513/4514 Group User’s Manual

Fig. 2.2.6 Timer 2 constant period interrupt setting example

Disable Interrupts

Timer 2 interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V1

“0”

!! !

All interrupts disabled (DI instruction)

Timer 2 interrupt occurrence disabled

(TV1A instruction)

Stop Timer Operation

Timer is temporarily stopped.

Timer 2 count source is selected.

Timer control register W2

Timer 2 stop (TW2A instruction)

16-bit timer (WDT) underflow signal selected

for count source

Set Timer Value

Timer 2 count time is set. (The formula is shown gA below.)

Timer 2 reload register R2 “2716”

Timer count value 39 set (T2AB instruction)

Clear Interrupt Request

Timer 2 interrupt activated condition is cleared.

Timer 2 interrupt request flag T2F “0”

Timer 2 interrupt activated condition cleared

(SNZT2 instruction)

Note when the interrupt request is cleared

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

interrupt request flag T2F, insert the NOP instruction after the SNZT2 instruction.

Start Timer 2 Operation

Timer 2 temporarily stopped is restarted.

Timer control register W2

Timer 2 operation start (TW2A instruction)

Enable Interrupts

The timer 2 interrupt which is temporarily disabled is enabled.

Interrupt control register V1

Interrupt enable flag INTE

“1”

Timer 2 interrupt occurrence enabled

(TV1A instruction)

All interrupts enabled (EI instruction)

!! !

Constant period interrupt execution start

gA The timer 2 count value to make the interrupt occur every about 2 s is set as follows.

2 s

≅ (4.0 MHz)

! 3

! 2

! (39+1)

–1

System clock Instruction

clock

16-bit

fixed

dividing

frequency

Timer 2

count

value

“!”: it can be “0” or “1.”

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