Atmega32(l) – Rainbow Electronics ATmega32L User Manual
Page 46
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46
ATmega32(L)
2503C–AVR–10/02
• 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
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
GICR, r16
; Move interrupts to boot Flash section
ldi
r16, (1<<IVSEL)
out
GICR, r16
ret
C Code 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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