mk mk

MCF5223x UART TXEMPTY interrupt

Discussion created by mk mk on Nov 29, 2007
Latest reply on Nov 30, 2007 by mk mk
UART USR status register has TEMP (TXEMPTY) flag and TXRDY flag for signalling transmitter state, pretty standard stuff. But UIMR/UISR interrupt register has the flag only for TXRDY, there's no TXEMPTY here.

I'm interfacing with RS-485 network and TXEMPTY interrupt was always an obvious way to turn off the transmitter AFTER the whole data block is shifted onto the wire.

Is there really no TXEMPTY interrupt, or am I missing something ?