4513 datasheet(137/210 Pages) RENESAS

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APPLICATION

2.3 Timers

2-34

4513/4514 Group User’s Manual

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 1 operation is temporarily stopped.

Timer 2 count source is selected.

Timer control register W2

Timer 2 stop (TW2A instruction)

CNTR0 input selected for count source

Set Timer Value

Timer 2 count time is set.

Timer 2 reload register R2 “6316”

Timer count value 99 set (T2AB instruction)

g0 h

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 2 operation start (TW2A instruction)

Timer control register W2

! 1

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)

“!”: it can be “0” or “1.”

Fig. 2.3.5 CNTR1 input setting example

However, specify the pulse width input to CNTR0 pin/CNTR1 pin. Refer to section “2.3.4 Notes on use” for

the timer external input period condition.

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