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ATmega128 Fiches technique(PDF) 65 Page - ATMEL Corporation

No de pièce ATmega128
Description  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  386 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128 Fiches technique(HTML) 65 Page - ATMEL Corporation

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65
2467S–AVR–07/09
ATmega128
• 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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