
59
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
0x3C04
jmp
EXT_INT1
; IRQ1 Handler
...
;
0x3C32
jmp
SPM_RDY
; Store Program Memory Ready Handler
;
0x3C33
RESET: ldi
r16,high(RAMEND); Main program start
0x3C34
out
SPH,r16
; Set Stack Pointer to top of RAM
0x3C35
ldi
r16,low(RAMEND)
0x3C36
out
SPL,r16
0x3C37
sei
; Enable interrupts
0x3C38
<instr>
xxx
11.2
Register Description
11.2.1
Moving Interrupts Between Application and Boot Space
The MCU Control Register controls the placement of the Interrupt Vector table.
11.2.2
MCUCR – MCU Control Register
Bit 1 – IVSEL: Interrupt Vector Select
When the IVSEL bit is cleared (zero), the Interrupt Vectors are placed at the start of the Flash
memory. When 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-
tables, a special write procedure must be followed to change the IVSEL bit:
a.
Write the Interrupt Vector Change Enable (IVCE) bit to one.
b.
Within 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
This bit is not available in ATmega328P.
Bit 0 – IVCE: Interrupt Vector Change Enable
Bit
7654
3210
–
BODS
BODSE
PUD
–
IVSEL
IVCE
MCUCR
Read/Write
R
R/W
R
R/W
Initial Value
0000