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ATMEGA8515 Datasheet(PDF) 57 Page - ATMEL Corporation

Part # ATMEGA8515
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  257 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8515 Datasheet(HTML) 57 Page - ATMEL Corporation

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57
ATmega8515(L)
2512K–AVR–01/10
$C12
out
SPH,r16
; Set Stack Pointer to top of RAM
$C13
ldi
r16,low(RAMEND)
$C14
out
SPL,r16
$C15
sei
; Enable interrupts
$C16
<instr>
xxx
Moving Interrupts between
Application and Boot Space
The General Interrupt Control Register controls the placement of the Interrupt Vector
table.
General Interrupt Control
Register – GICR
• 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 begin-
ning of the Boot Loader section of the Flash. The actual address of the start of the Boot
Flash section is determined by the BOOTSZ Fuses. Refer to the section “Boot Loader
Support – Read-While-Write Self-Programming” on page 166 for details. To avoid unin-
tentional changes of Interrupt Vector tables, a special write procedure must be followed
to change the IVSEL bit:
1.
Write the Interrupt Vector Change Enable (IVCE) bit to one.
2.
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 fol-
lowing 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 pro-
grammed, interrupts are disabled while executing from the Application section. If
Interrupt Vectors are placed in the Application section and Boot Lock bit BLB12 is pro-
gramed, interrupts are disabled while executing from the Boot Loader section. Refer to
the section “Boot Loader Support – Read-While-Write Self-Programming” on page 166
for details on Boot Lock bits.
Bit
7
654
32
10
INT1
INT0
INT2
IVSEL
IVCE
GICR
Read/Write
R/W
R/W
R/W
R
R
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0


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