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数据搜索系统，热门电子元器件搜索 |
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ATmega169P 数据表(PDF) 284 Page - ATMEL Corporation |
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ATmega169P 数据表(HTML) 284 Page - ATMEL Corporation |
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284 / 393 page  284 8018N–AVR–08/09 ATmega169P 26.6 Entering the Boot Loader Program Entering the Boot Loader takes place by a jump or call from the application program. This may be initiated by a trigger such as a command received via USART, or SPI interface. Alternatively, the Boot Reset Fuse can be programmed so that the Reset Vector is pointing to the Boot Flash start address after a reset. In this case, the Boot Loader is started after a reset. After the applica- tion code is loaded, the program can start executing the application code. Note that the fuses cannot be changed by the MCU itself. This means that once the Boot Reset Fuse is pro- grammed, the Reset Vector will always point to the Boot Loader Reset and the fuse can only be changed through the serial or parallel programming interface. Note: 1. “1” means unprogrammed, “0” means programmed Table 26-4. Boot Reset Fuse(1) BOOTRST Reset Address 1 Reset Vector = Application Reset (address 0x0000) 0 Reset Vector = Boot Loader Reset (see Table 26-6 on page 291) |
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