P89V51RD2BN problem

[xccx]

hi,
I have two P89V51RD2BN. One has Philips logo (i think this is an old one), then other one has NXP logo. I'm trying to downlaod a program to both chips. The Philips one can work the program properly, but the NXP one cannot. The program is about showing some words on LCM display. What is the problem? and how can I fix this problem?

[Andy Ayre]

Are you getting any errors in Flash Magic? Can you verify after programming without a problem? If so then you will need to debug your program in the usual way.

Also make sure the devices really do have the exact same part number and are running on the exact same hardware. If you are not swapping the devices in the same hardware (i.e. PLCC socket) then I would suspect the hardware first.

Andy

[xccx]

hi, thanks for replying.
I didn't get any error message. I can verify the program on Philips chip, but not NXP chip.
I used the same hardware for both chips.

[xccx]

we solved the problem, thanks

[Andy Ayre]

What was the problem and what was the solution? Posting the details will help others in the future.

Andy