Transmitter Register - Motorola DragonBall MC68328 User Manual

UART
FRAME ERROR
While high, this read-only bit indicates that the current character had a framing error
(missing stop bit), indicating the possibility of corrupted data. This bit is updated for each
character read from the FIFO.
0 = Character has no framing error
1 = Character has a framing error
BREAK
While high, this read-only bit indicates that the current character was detected as a
BREAK. The data bits are all 0 and the stop bit was also 0. The FRAME ERROR bit will
always be set when this bit is set. If odd parity is selected, PARITY ERROR will also be
set along with this bit. This bit is updated for each character read from the FIFO.
0 = Character is not a break character
1 = Character is a break character
PARITY ERROR
While high, this read-only bit indicates that the current character was detected with a par-
ity error, indicating the possibility of corrupted data. This bit is updated for each character
read from the FIFO. While parity is disabled, this bit always reads zero.
DATA
These read-only bits are the next receive character in the FIFO. These bits have no mean-
ing if the DATA READY bit is 0. While in 7-bit mode, the MSB is forced to 0. While in 8-bit
mode, all bits are active.

8.2.8 Transmitter Register

This register controls the transmitter operation.
15 14 13 12
FIFO FIFO TX SEND
EMPTY HALF AVAIL BREAK
ADDRESS: $(FF)FFF906
FIFO EMPTY
This read-only bit indicates that the transmit FIFO is empty.
0 = Transmitter FIFO is not empty
1 = Transmitter FIFO empty
FIFO HALF
This read-only bit indicates that the transmit FIFO is less than half full.
0 = Transmitter FIFO more than half full
1 = Transmitter FIFO less than half full
8-10 MC68328 DRAGONBALL PROCESSOR USER'S MANUAL
11 10 9 8
IGNORE CTS CTS
0
CTS STATUS DELTA
Figure 8-5. Transmitter Register
7 6 5 4
TX DATA
3 2 1 0
Reset Value: $0000
MOTOROLA