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AT90USB162 Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT90USB162 Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 28 page 2 7618C–AVR–07/08 2. Bootloader Environment The bootloader is located in the boot section of the on-chip Flash memory, it manages the USB communication protocol and performs read/write operations to the on-chip memories (Flash/EEPROM). The USB bootloader is loaded in the “Bootloader Flash Section” of the on-chip Flash memory. The size of the bootloader flash section must be larger than the bootloader size.USB products are factory configured with the default on-chip USB bootloader and the required bootsection configuration. Table 2-1. USB Bootloader Parameters Figure 2-1. Physical Environment 3. Bootloader Activation As specified in the AT90USB datasheet, the bootloader can be activated by one of the following conditions: • Regular application execution: A jump or call from the user application program. This may be initiated by a trigger such as a command received via USB, USART or SPI and decoded by the application. Product Flash Bootsection Size Configuration VID / PID Bootloader Start Address (word address) AT90USB1287 4 KWord 0x03EB / 0x2FFB 0xf000 AT90USB1286 AT90USB647 2 KWord 0x03EB / 0x2FF9 0x7800 AT90USB646 AT90USB162 0x03EB / 0x2FFA 0x1800 AT90USB82 0x03EB / 0x2FF7 0x0800 ATmega32U4 0x03EB / 0x2FF4 0x3800 ATmega16U4 0x03EB / 0x2FF3 0x0800 USB Bootloader in Boot section Flash Application section Read/Write USB Interface EEPROM Data Read/Write DFU Class |
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