Hi all,

I have a problem with 80C31, the chip just keeps to restart by itself at
a paticular point in the program, which is just a normal instruction code :
printf("rRadius = %4.3fnr", radius); where radius is a double type number
(this code will send a tring of char to Tx pin, after convert double to chars)

If I move this line to different location in the program, it works fine. I also
monitor the RST and VCC pin, they are OK.

There's another strange thing, if I use different bat version of 80C31, it work perfect!!! The one we are using is Philips P80C31SBPN.

Any advice is appreciated,

Loan Nguyen.