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Hi All, When simulating an interupt from serial port RX0, I cannot succeed in affecting SBUF0 to a local variable, the watch window shows this variable to 0 even if SBUF0 is set. Here is my code : static void serial_port_0_isr (void) interrupt COM0_VECT { unsigned char data_received; if (RI != 0) { RI = 0; data_received = SBUF0; ... } } on the above code, data_received is always 0 even if SBUF0 is set. To set SBUF0, I use the serial port window from the simulator. any idea would be appreciated.