4513 datasheet(128/210 Pages) RENESAS

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APPLICATION

2.2 Interrupts

2-25

4513/4514 Group User’s Manual

2.2.4 Notes on use

(1)

Setting of INT0 interrupt valid waveform

Depending on the input state of P30/INT0 pin, the external interrupt request flag (EXF0) may be set

to “1” when the interrupt valid waveform is changed. Accordingly, set a value to the bit 2 of register

I1, and execute the SNZ0 instruction to clear the EXF0 flag to “0” after executing at least one

instruction.

(2)

Setting of INT1 interrupt valid waveform

Depending on the input state of P31/INT1 pin, the external interrupt request flag (EXF1) may be set

to “1” when the interrupt valid waveform is changed. Accordingly, set a value to the bit 2 of register

I2, and execute the SNZ1 instruction to clear the EXF1 flag to “0” after executing at least one

instruction.

(3)

Multiple interrupts

Multiple interrupts cannot be used in the 4513/4514 Group.

(4)

Notes on interrupt processing

When the interrupt occurs, at the same time, the interrupt enable flag INTE is cleared to “0” (interrupt

disable state). In order to enable the interrupt at the same time when system returns from the

interrupt, write EI and RTI instructions continuously.

(5)

P30/INT0 pin

The P30/INT0 pin need not be selected the external interrupt input INT function or the normal output

port P30 function. However, the EXF0 flag is set to “1” when a valid waveform is input to INT0 pin

even if it is used as an I/O port P30.

(6)

P31/INT1 pin

The P31/INT1 pin need not be selected the external interrupt input INT function or the normal output

port P31 function. However, the EXF1 flag is set to “1” when a valid waveform is input to INT1 pin

even if it is used as an I/O port P31.

(7)

EPOF instruction

Be sure to disable interrupts by executing the DI instruction before executing the EPOF instruction.

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