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ATmega16-16PU Arkusz danych(PDF) 48 Page - ATMEL Corporation

Numer części ATmega16-16PU
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Arkusz danych(HTML) 48 Page - ATMEL Corporation

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48
2466S–AVR–05/09
ATmega16(L)
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 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-While-Write
Self-Programming” on page 246 for details. To avoid unintentional 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 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-While-
Write Self-Programming” on page 246 for details on Boot Lock bits.
• 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
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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