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Table F-7. Transmitter Status Register (TSR)
Bit
1-2
High/Low Output.
0 = High output.
1 = Low output.
2 = High output.
3 = Loop-back mode.
3
Break. In asynchronous mode, a break is sent when this bit
is set.
4
End of Transmission.
5
Auto Turnaround.
6
Underrun Error.
7
Buffer Empty. This bit is set when a character is transferred
from the transmit buffer, and cleared when new data is
written to it.
Register 24. USART Date Register (UDR). Serial data is
sent and received through this register. Writing a value
places data in the send buffer, while reading this register re
turns the next character in the receive buffer.
The MFP Chip
Function
307
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