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Peripheral Architecture
2.4.3 Data Format
The UART transmits in the following format:
1 START bit + data bits (5, 6, 7, 8) + 1 PARITY bit (optional) + STOP bit (1, 1.5, 2)
It transmits 1 START bit; 5, 6, 7, or 8 data bits, depending on the data width selection; 1 PARITY bit, if
parity is selected; and 1, 1.5, or 2 STOP bits, depending on the STOP bit selection.
The UART receives in the following format:
1 START bit + data bits (5, 6, 7, 8) + 1 PARITY bit (optional) + STOP bit (1)
It receives 1 START bit; 5, 6, 7, or 8 data bits, depending on the data width selection; 1 PARITY bit, if
parity is selected; and 1 STOP bit.
The protocol formats are shown in Figure 4
Figure 4. UART Protocol Formats
D0 D1 D2 D3 D4 PARITY STOP1
Transmit/Receive for 5-bit data, parity Enable, 1 STOP bit
D0 D1 D2 D3 D4 D5 PARITY STOP1
Transmit/Receive for 6-bit data, parity Enable, 1 STOP bit
D0 D1 D2 D3 D4 D5 D6 PARITY STOP1
Transmit/Receive for 7-bit data, parity Enable, 1 STOP bit
D0 D1 D2 D3 D4 D5 D6 D7 PARITY STOP1
Transmit/Receive for 8-bit data, parity Enable, 1 STOP bit
2.5 Endianness Considerations
Since the UART transfers 8-bit data externally, and proper endianness is maintained automatically within
the DM643x DMP, there are no endianness considerations when using the DM643x UART peripheral.
13
SPRU997C–December 2009 Universal Asynchronous Receiver/Transmitter (UART)
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