Messages

Hello,

The IAP code from this site works for the P89LPC9221 with a few modifications. PGM_MTP has to be FF03h instead of FF00h. I discovered that the code from the code memory was read out the right way when I changed PGM_MTP. I was still not able to write to the memory after I modified PGM_MTP. In the user manual there is a note about an authorization key. You must set the authorization key before you process any write/erase procedures. I added these 2 commands at every write/erase procedure (before the write/erase lcall instruction):
   MOV R0,#0FFH   ; IAP authorization key.
   MOV @R0,#96H

Everything works after these modifications. I hope this will help somebody else.

Kind regards,
Mark



Post Edited (02-28-06 07:14)

You can set a shorter time out for a timer in mode2 and count the time-outs/overflows. You can poll the TF0/TF1 bit. Clear the bit and increase the time-out counter. Break the loop if 1sec delay is reached (Time-out time * CounterValue = 1 sec.). See data-sheet for more information about the timers.

Regards,
Mark



Post Edited (02-24-06 07:56)

Hello,

At the moment I am working on a project with a P89LPC9221 device. I want to use the IAP routines to update the processor. I wrote some IAP-lite routines and these routines work fine. The IAP routines from this site don