Version 4 of the Bootloader

[Andy Ayre]

Version 4 of the bootloader in the P89V51Rx2 devices suffers from a couple of issues. To determine the version of your bootloader:

• Choose ISP -> Read Device Signature...
• The bootloader version will be displayed

Block 0 Erase

Version 4 of the bootloader has an issue with erasing block zero. The solution is to upgrade the bootloader.

Upgrading the Bootloader

Version 4 of the bootloader should be upgraded to version 5 first; see link (1). Follow the instructions. If it doesn't work then try a terminal program such as Hyperterminal to manually update the bootloader.

Once version 5 is installed it can be upgraded to version 7 using the functionality built into Flash Magic; see link (2).

Version 5 solves the block zero erase issue. Version 7 adds the option to use a pin to start the bootloader.

(1) http://ics.nxp.com/support/documents/microcontrollers/all/?scope=P89V51RD2
(2) http://www.flashmagictool.com/resources.html