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ATmega128
$F049
$F04A
out
sei
SPL,r16
; Enable interrupts
$F04B
<instr>
xxx
Moving Interrupts
Between Application
and Boot Space
MCU Control Register
The General Interrupt Control Register controls the placement of the interrupt vector table.
– MCUCR
Bit
Read/ W rite
Initial Value
7
SRE
R/ W
0
6
SRW10
R/ W
0
5
SE
R/ W
0
4
SM1
R/ W
0
3
SM0
R/ W
0
2
SM2
R/ W
0
1
IVSEL
R/ W
0
0
IVCE
R/ W
0
MCUCR
? Bit 1 – IVSEL: Interrupt Vector Select
W hen the IVSEL bit is cleared (zero), the interrupt vectors are placed at the start of the Flash
memory. W hen this bit is set (one), the interrupt vectors are moved to the beginning of the Boot
Loader section of the flash. The actual address of the start of the Boot Flash section is deter-
mined by the BOOTSZ fuses. Refer to the section “Boot Loader Support – Read- W hile- W rite
Self-Programming” on page 273 for details. To avoid unintentional changes of interrupt vector
tables, a special write procedure must be followed to change the IVSEL bit:
1. W rite the Interrupt Vector Change Enable (IVCE) bit to one.
2. W ithin four cycles, write the desired value to IVSEL while writing a zero to IVCE.
Interrupts will automatically be disabled while this sequence is executed. Interrupts are disabled
in the cycle IVCE is set, and they remain disabled until after the instruction following the write to
IVSEL. If IVSEL is not written, interrupts remain disabled for four cycles. The I-bit in the Status
Register is unaffected by the automatic disabling.
Note:
If interrupt vectors are placed in the Boot Loader section and Boot Lock bit BLB02 is programmed,
interrupts are disabled while executing from the Application section. If interrupt vectors are placed
in the Application section and Boot Lock bit BLB12 is programed, interrupts are disabled while
executing from the Boot Loader section. Refer to the section “Boot Loader Support – Read- W hile-
W rite Self-Programming” on page 273 for details on Boot Lock bits.
63
2467X–AVR–06/11
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