Hi Erik,

you are right, only T/P89C51Rx2 are interchangeable.

I use the T89C51CC01 with a custom boot loader over CAN at 07C00h and it works great.

I must admit, that it works not at the beginning, but no problem, since PSEN on GND gave me a second try.


Now I need 8kB RAM and I2C, so the P89C668 with external CAN (SJA1000) was my choice.

Now also a custom boot loader over CAN must be implemented.

So I try to find a way to place the custom boot loader at 0000h and also the application.

My intention, the boot loader catch the LJMP at 0000h of my application hex file and place it on the end of the boot loader.


Peter