4513 datasheet(121/210 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-18

4513/4514 Group User’s Manual

Fig. 2.2.2 INT0 interrupt setting example

Note: The valid waveforms causing the interrupt must be retained at their level for 4 cycles or more

of system clock.

Set Port

Port used for INT0 interrupt is set to input port.

!! Both edges detection selected (TI1A instruction)

Disable Interrupts

INT0 interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V1

“0”

!! !

All interrupts disabled (DI instruction)

INT0 interrupt occurrence disabled

(TV1A instruction)

Port P30 output latch

!! !

Set to input (OP3A instruction)

Set Valid Waveform

Valid waveform of INT pin is selected.

Both edges detection selected

Interrupt control register I1

Clear Interrupt Request

External interrupt activated condition is cleared.

INT0 interrupt request flag EXF0

“0”

INT0 interrupt activated condition cleared

(SNZ0 instruction)

Note when the interrupt request is cleared

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

interrupt request flag EXF0, insert the NOP instruction after the SNZ0 instruction.

Enable Interrupts

The INT0 interrupt which is temporarily disabled is enabled.

Interrupt control register V1

Interrupt enable flag INTE

“1”

!! !

INT0 interrupt occurrence enabled

(TV1A instruction)

All interrupts enabled (EI instruction)

INT0 interrupt execution started

“!”: it can be “0” or “1.”

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