AN1310 Bootloader Features The key features of the AN1310, High-Speed Serial Bootloader for PIC16 and PIC18 Devices include: Small firmware code size (less than 450 instruction words on most devices) Automatic baud rate synchronization to the host Baud rate flexibility, from 1,200 bps to 3 Mbps for extremely fast programming A 16-bit CRC packet and Flash memory verification for quick verification of successful programming, even at low baud rates An advanced write planner that eliminates unnecessary erase/write transactions Support for a wide variety of PIC16 and PIC18 devices through an essential device characteristics database Optional application remapping that does not require linker script modifications or remapping of interrupt service routines A forced bootloader re-entry mechanism requiring minimal start-up delay and no additional I/O pins or application firmware code to re-enter the bootloader Optional MCLR Reset control, allowing the host PC application to automatically reset the device for robust bootloader re-entry PC software rewritten in C/C++ for the crossplatform, Qt SM SDK, enabling Linux host support by recompiling the PC software source code A simple, Serial Terminal Application mode, provided by the PC software, that eliminates time wasted by switching between separate bootloader host and serial terminal applications Note: Prerequisites If a review of the preceding features list indicates that a different bootloader is needed, see Alternative References. Once the application firmware is programmed, the bootloader cedes control, allowing normal application execution until the bootloader is called. When the bootloader firmware is activated, a host PC can use a serial protocol to read, write and verify updates to the microcontroller's application firmware. The kernel uses a small portion of program memory not normally used by the firmware s main application.
This is done by a bootloader providing a firmware kernel, residing in the microcontroller.
Microchip s enhanced Flash microcontrollers enable firmware to program itself. 1 High-Speed Serial Bootloader for PIC16 and PIC18 Devices Author: INTRODUCTION E.
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