Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 55)

ATmega8515(L)

2512A–AVR–04/02

• Bit 0 – IVCE: Interrupt Vector Change Enable

The IVCE bit must be written to logic one to enable change of the IVSEL bit. IVCE is

clearedbyhardware four cycles after it iswritten orwhen IVSEL iswritten. Setting the

IVCE bit will disableinterrupts, as explained in the IVSEL description above. See Code

Example below.

Assembly Code Example

Move_interrupts:

; Enable change of interrupt vectors

ldi r16, (1<<IVCE)

out GICR, r16

; Move interrupts to boot flash section

ldi r16, (1<<IVSEL)

out GICR, r16

ret

CCode Example

void Move_interrupts(void)

{

Enable change of interrupt vectors

GICR = (1<<IVCE);

/* Move interrupts to boot flash section */

GICR = (1<<IVSEL);

}

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