AN3123 Datasheet, PDF (15/30 Pages) STMicroelectronics – Using the UART interfaces in the SPEAr embedded MPU family

AN3123
UART controller data flow
This is a 16-bit read/write register which contains data:
● In transmit mode, if FIFOs are enabled, data written to this location is pushed into the
transmit FIFO. If FIFOs are not enabled, data is stored in the transmitter holding
register.
● In receive mode, if FIFOs are enabled, the data byte and the 4-bit status (break, frame,
parity and overrun) is pushed into the 12-bit receive FIFO. If FIFOs are not enabled,
data byte and status are stored in the receiving holding register.
Doc ID 16862 Rev 2
15/30