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ATmega128-16AU Fiches technique(PDF) 64 Page - ATMEL Corporation |
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ATmega128-16AU Fiches technique(HTML) 64 Page - ATMEL Corporation |
64 / 386 page 64 2467S–AVR–07/09 ATmega128 $F049 out SPL,r16 $F04A sei ; Enable interrupts $F04B <instr> xxx Moving Interrupts Between Application and Boot Space The General Interrupt Control Register controls the placement of the interrupt vector table. MCU Control Register – MCUCR • 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 273 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 273 for details on Boot Lock bits. Bit 765 4321 0 SRE SRW10 SE SM1 SM0 SM2 IVSEL IVCE MCUCR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 |
Numéro de pièce similaire - ATmega128-16AU |
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Description similaire - ATmega128-16AU |
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