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Hi, I use AT89S52 in a project. I send and receive data through TXD, RXD pins to a GSM module for sending SMS to another mobile equipment. I use watchdog facility and the watchdog counter is reset at every 256 counts. My crystal frequency is 11.0592 MHz. It happens once in a while that the uC doesn't respond and remains as if it hangs. Then it has to be RESET again. I doubt whether it happens while serial data reception and sending happens simultaneously. I wrote the program in C using KEIL IDE. My questions are 1) What are the special precautions to be taken in this case?(sending and receiving simultaneously) 2)why this happens even when the watchdog is active? It will be highly appreciated if anybody can give some guidance.
2)It never went to such situation when tested in my place (actual working condition is electrically noisy)
the methods to handle noise sensitivity are described here www.8052.com/.../119926
CLEARLY you have TWO problems a) you are noise sensitive b) you either miss a supervisor or your WD is handled wrong.
Erik
Thank you for the useful link. But I don't know whether I can conclude that it is a noise related problem. Right now I am inclined to believe so.