4513 datasheet(123/210 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-20

4513/4514 Group User’s Manual

Fig. 2.2.4 INT1 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 INT1 interrupt is set to input port.

!! Both edges detection selected (TI2A instruction)

Disable Interrupts

INT1 interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V1

“0”

All interrupts disabled (DI instruction)

INT1 interrupt occurrence disabled

(TV1A instruction)

Port P31 output latch

! Set to input (OP3A instruction)

Set Valid Waveform

Valid waveform of INT pin is selected.

Both edges detection selected

Interrupt control register I2

Clear Interrupt Request

External interrupt activated condition is cleared.

INT1 interrupt request flag EXF1

“0”

INT1 interrupt activated condition cleared

(SNZ1 instruction)

Note when the interrupt request is cleared

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

interrupt request flag EXF1, insert the NOP instruction after the SNZ1 instruction.

Enable Interrupts

The INT1 interrupt which is temporarily disabled is enabled.

Interrupt control register V1

Interrupt enable flag INTE

“1”

INT1 interrupt occurrence enabled

(TV1A instruction)

All interrupts enabled (EI instruction)

INT1 interrupt execution started

“!”: it can be “0” or “1.”

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