INTRODUCTION Among the many features built into Microchip’s Enhanced FLASH Microcontroller devices is the capa- bility of the program memory to self-program. This very useful feature has been deliberately included to give the user the ability to perform bootloading operations. Devices like the PIC18F458 are designed with a desig- nated “boot block”, a small section of protectable pro- gram memory allocated specifically for bootload firmware. AN247 A CAN Bootloader for PIC18F CAN Microcontrollers The drawback to this is a lack of efficiency, as directly Author: Ross M. Fosler manipulating the target memory and manually verifying Microchip Technology Inc. data takes significant time on the CAN bus. To make the operation more efficient, the programming INTRODUCTION target could be given some intelligence, like self- Among the many features……