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USART Operation: UART Mode
14-16 USART Peripheral Interface, UART Mode
Typical Baud Rates and Errors
Standard baud rate frequency data for UxBRx and UxMCTL are listed in
Table 14−2 for a 32,768-Hz watch crystal (ACLK) and a typical 1,048,576-Hz
SMCLK.
The receive error is the accumulated time versus the ideal scanning time in the
middle of each bit. The transmit error is the accumulated timing error versus
the ideal time of the bit period.
Table 14−2.Commonly Used Baud Rates, Baud Rate Data, and Errors
Divide by A: BRCLK = 32,768 Hz B: BRCLK = 1,048,576 Hz
Baud
Rate
A: B: UxBR1 UxBR0 UxMCTL
Max.
TX
Error %
Max.
RX
Error %
Synchr.
RX
Error %
UxBR1 UxBR0 UxMCTL
Max.
TX
Error %
Max.
RX
Error %
1200 27.31 873.81 0 1B 03 −4/3 −4/3 ±2 03 69 FF 0/0.3 ±2
2400 13.65 436.91 0 0D 6B −6/3 −6/3 ±4 01 B4 FF 0/0.3 ±2
4800 6.83 218.45 0 06 6F −9/11 −9/11 ±7 0 DA 55 0/0.4 ±2
9600 3.41 109.23 0 03 4A −21/12 −21/12 ±15 0 6D 03 −0.4/1 ±2
19,200 54.61 0 36 6B −0.2/2 ±2
38,400 27.31 0 1B 03 −4/3 ±2
76,800 13.65 0 0D 6B −6/3 ±4
115,200 9.1 0 09 08 −5/7 ±7