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RS-232DB9 Datasheet(PDF) 21 Page - ATMEL Corporation |
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RS-232DB9 Datasheet(HTML) 21 Page - ATMEL Corporation |
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21 / 39 page  Using the STK525 STK525 Hardware User Guide 2-21 7608A–AVR–04/06 The HWB pin of the AT90USBxxx allows to force the bootloader section execution after reset. (Refer to AT90USBxxx datasheet section “boot loader support”). To force bootloader execution, operate as follows: Press both “RST” and “HWB” push buttons First release the “RST” push button Release the “HWB” push button For more information about the USB bootloader and FLIP software, please refer to the ‘USB bootloader datasheet’ document and ‘FLIP User Manual’. 2.8.2 Programming with AVR ISP mkII Programmer The AT90USBxxx can be programmed using specific SPI serial links. This sub section will explain how to connect the programmer. The Flash, EEPROM and all Fuses and Lock Bits options ISP-programmable can be programmed individually or with the sequential automatic programming option. The AVR ISP mkII programmer is a compact and easy-to-use In-System Programming tool for developing applications with AT90USBxxx. Due to the small size, it is also an excellent tool for field upgrades of existing applications. The AVR ISP programming interface is integrated in AVR Studio®. To program the device using AVR ISP programmer, connect the 6-wire cable on the ISP connector of the STK525 as shown in Figure 2-20. Note: See AVR Studio® on-line Help for information. Figure 2-20 . Programming from AVR ISP mkII programmer 2.8.3 Programming with STK500 The AT90USBxxx can be programmed using the serial programming mode in the AVR Studio STK500 software. The software interface (In-System Programming of an external target system) is integrated in AVR Studio®. |
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