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I wrote a small program to test the behaviour of 'printf' with unsigned char. It contained just the following loop: for (i=0; i<10; i++) { printf("i = %d\n", i); } Now when I watch the serial I/O window it gives me the following values: 0 256 512 768 1024 1280 and so on... I'm not worried about the value of 'i' because it seems to be OK when I set up a watch on it. Apparently its something to do with the way the char value is sent to the emulated serial port. I can observe the following behaviour: 0 = 00000000 00000000 --> to serial port 256=00000001 00000000 --> to serial port 512=00000010 00000000 --> to serial port now what I can't understand is why is the all zero byte being sent to the serial port first. Please enlighten me on this. Regards, Vipin Mehta