Rainbow-electronics ATmega128L Manual do Utilizador descarregar pdf (Página 59)

100

101

ATmega128(L)

2467B–09/01

• 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

cleared by hardware four cycles after it is written or when IVSEL is written. Setting the

IVCE bit will disable interrupts, 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 MCUCR, r16

; Move interrupts to boot flash section

ldi r16, (1<<IVSEL)

out MCUCR, r16

ret

C Code Example

void Move_interrupts(void)

{

/* Enable change of interrupt vectors */

MCUCR = (1<<IVCE);

/* Move interrupts to boot flash section */

MCUCR = (1<<IVSEL);

}

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