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AN247 Datasheet(PDF) 10 Page - Microchip Technology |
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AN247 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 32 page  AN247 DS00247A-page 10 2003 Microchip Technology Inc. RESOURCES For most builds, the PIC18F CAN bootloader resides within the device’s Boot Block (000h to 1FFh), and does not impact the normal Program Memory space beyond the relocation of the interrupt vectors. As noted, some combinations of compile time options (for example, selecting both PG mode and self-verify) will result in a bootloader that exceeds the Boot Block size. In these cases, it will be necessary to relocate any user application code and the interrupt vectors above the boundary of the bootloader, being careful to avoid code overlap. If Program Memory space is not critical, the optimal solution may be to locate all application code and the interrupt vectors above the upper bound- ary of Block 0 (1FFFh). Write protecting Block 0 to protect the bootloader is desirable, but not essential. The bootloader uses 12 bytes of data SRAM during operation. It also uses 1 byte of data EEPROM at all times, as the normal operation/bootloader flag. REFERENCES W. Lawrenz, CAN System Engineering From Theory to Practical Applications. New York: Springer-Verlag New York Inc., 1997. MPLAB-CXX Compiler User’s Guide, Microchip Technology Inc., 2000 (Document number DS51217). Microchip Technology Inc., Application Note AN851, “A FLASH Bootloader for PIC16 and PIC18 Devices” (Document number DS00851). |
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