Problem with CGMXFC, PTB0 & PTB1 pins in HC98LJ12

[balajiprabhakar]

Dear all,

Please help me in sorting the problem, I am facing using LJ12.

I am not getting any output, i.e., the voltage at the 3 pins, CGMXFC, PTB0 & PTB1 is 0V. But the normal output voltage at the pins are, for CGMXFC - 1.7V, for PTB0 & PTB1 is 5V.

Can anyone suggest what could be the reason for the problem. Because of this problem, the controller hangs and doesnot respond to any signal.

With regards,

GNS

[Ake]

Hello,

I have read your message, but I am afraid I cannot help you without more information.

I would like to know the following:

1) Do you have a development system where you can program and run the HC908LJ12?

And do have it attached when the problems appear?

2) Have you tried to write a simple program that sets up an I/O port and wiggle with a pin?

3) Does this problem appear after you have developed a product, burned an HC908LJ12, and tried to run it on its own?

4) That the output voltage on two I/Os seem to quite low could indicate some trouble with the Vdd.

What voltage have you got there?

Well, I can't promise that I can help you. But at least I could try.

Regards,

Ake