4513 datasheet(139/210 Pages) RENESAS

139 / 210 page

APPLICATION

2.3 Timers

2-36

4513/4514 Group User’s Manual

Fig. 2.3.7 Timer start by external input setting example (1)

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)

INT0 interrupt occurrence disabled

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 4 selected

Set Timer Value

Timer 1 count time is set.

Timer 1 reload register R1 “5216”

Timer count value 82 set (T1AB instruction)

Set Port

P30/INT0 pin is set to INT0 input.

Port P30 output latch ! ! !

INT0 input set (OP3A instruction)

Set Valid Waveform

Valid waveform of INT0 pin is selected. Timer 1 control is enabled.

Interrupt control register I1 !

Rising edge detected (TI1A instruction)

g0 h

Clear Interrupt Request

Timer 1 interrupt activated condition is cleared.

INT0 interrupt activated condition is cleared.

Timer 1 interrupt request flag T1F

INT0 interrupt request flag EXF0

“0”

Timer 1 interrupt activated condition cleared

(SNZT1 instruction)

INT0 interrupt activated condition cleared

(SNZ0 instruction)

“0”

Note when the interrupt request is cleared

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

interrupt request flags T1F and EXF0, insert the NOP instruction after the SNZT1

and SNZ0 instructions.

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)

Timer start by external input

“!”: it can be “0” or “1.”

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