Texas Instruments MSP430x1xx User Manual page 276

USART Operation: UART Mode
Typical Baud Rates and Errors
Standard baud rate frequency data for UxBRx and UxMCTL are listed in
Table 13−2 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 13−2.Commonly Used Baud Rates, Baud Rate Data, and Errors
Divide by
Baud
A: B: UxBR1
Rate
1200 27.31 873.81 0
2400 13.65 436.91 0
4800 6.83 218.45 0
9600 3.41 109.23 0
19,200 54.61
38,400 27.31
76,800 13.65
115,200 9.1
13-16
USART Peripheral Interface, UART Mode
A: BRCLK = 32,768 Hz
Max. Max.
TX RX
Error % Error %
UxBR0 UxMCTL
1B 03 −4/3 − 4/3
0D 6B − 6/3 − 6/3
06 6F − 9/11 − 9/11
03 4A − 21/12 − 21/12
B: BRCLK = 1,048,576 Hz
Synchr.
RX
Error %
UxBR1 UxBR0 UxMCTL
± 2
03 69 FF
± 4
01 B4 FF
± 7
0 DA 55
± 15
0 6D 03
0 36 6B
0 1B 03
0 0D 6B
0 09 08
Max. Max.
TX RX
Error % Error %
± 2
0/0.3
± 2
0/0.3
± 2
0/0.4
± 2
−0.4/1
± 2
−0.2/2
± 2
− 4/3
± 4
− 6/3
± 7
− 5/7