PIC Serial Communication using Interrupt In my Last Post we studied the serial communication of the PIC18. All sample programs in that Post used the polling method. In this Post we explore interrupt based serial communication, which allows the PIC18 to do many things, in addition to sending and receiving data from the serial communication port. RCIF and TXIF flags and interrupts TXIF (transfer interrupt) is raised when the last bit of the framed data, the stop bit, is transferred, indicating that the TXREG register is ready to transfer the next byte. RCIF (received interrupt) is raised when the entire frame of data, including the stop bit, is received. In other words, when the RCREG register has a byte, RCIF is raised to indicate that the received byte needs to be picked up before it is lost (overrun) by new incoming serial data. As far as serial communication is concerne...
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