Datasheet

USCI Operation: UART Mode www.ti.com
15.3.13 Typical Baud Rates and Errors
Standard baud rate data for UCBRx, UCBRSx and UCBRFx are listed in Table 15-4 and Table 15-5 for a
32768-Hz crystal sourcing ACLK and typical SMCLK frequencies. Ensure that the selected BRCLK
frequency does not exceed the device-specific maximum USCI input frequency (see the device-specific
data sheet).
The receive error is the accumulated time versus the ideal scanning time in the middle of each bit. The
worst case error is given for the reception of an 8-bit character with parity and one stop bit including
synchronization error.
The transmit error is the accumulated timing error versus the ideal time of the bit period. The worst case
error is given for the transmission of an 8-bit character with parity and stop bit.
Table 15-4. Commonly Used Baud Rates, Settings, and Errors, UCOS16 = 0
BRCLK
Baud Rate
Frequency UCBRx UCBRSx UCBRFx Maximum TX Error [%] Maximum RX Error [%]
[Baud]
[Hz]
32,768 1200 27 2 0 -2.8 1.4 -5.9 2.0
32,768 2400 13 6 0 -4.8 6.0 -9.7 8.3
32,768 4800 6 7 0 -12.1 5.7 -13.4 19.0
32,768 9600 3 3 0 -21.1 15.2 -44.3 21.3
1,048,576 9600 109 2 0 -0.2 0.7 -1.0 0.8
1,048,576 19200 54 5 0 -1.1 1.0 -1.5 2.5
1,048,576 38400 27 2 0 -2.8 1.4 -5.9 2.0
1,048,576 56000 18 6 0 -3.9 1.1 -4.6 5.7
1,048,576 115200 9 1 0 -1.1 10.7 -11.5 11.3
1,048,576 128000 8 1 0 -8.9 7.5 -13.8 14.8
1,048,576 256000 4 1 0 -2.3 25.4 -13.4 38.8
1,000,000 9600 104 1 0 -0.5 0.6 -0.9 1.2
1,000,000 19200 52 0 0 -1.8 0 -2.6 0.9
1,000,000 38400 26 0 0 -1.8 0 -3.6 1.8
1,000,000 56000 17 7 0 -4.8 0.8 -8.0 3.2
1,000,000 115200 8 6 0 -7.8 6.4 -9.7 16.1
1,000,000 128000 7 7 0 -10.4 6.4 -18.0 11.6
1,000,000 256000 3 7 0 -29.6 0 -43.6 5.2
4,000,000 9600 416 6 0 -0.2 0.2 -0.2 0.4
4,000,000 19200 208 3 0 -0.2 0.5 -0.3 0.8
4,000,000 38400 104 1 0 -0.5 0.6 -0.9 1.2
4,000,000 56000 71 4 0 -0.6 1.0 -1.7 1.3
4,000,000 115200 34 6 0 -2.1 0.6 -2.5 3.1
4,000,000 128000 31 2 0 -0.8 1.6 -3.6 2.0
4,000,000 256000 15 5 0 -4.0 3.2 -8.4 5.2
8,000,000 9600 833 2 0 -0.1 0 -0.2 0.1
8,000,000 19200 416 6 0 -0.2 0.2 -0.2 0.4
8,000,000 38400 208 3 0 -0.2 0.5 -0.3 0.8
8,000,000 56000 142 7 0 -0.6 0.1 -0.7 0.8
8,000,000 115200 69 4 0 -0.6 0.8 -1.8 1.1
8,000,000 128000 62 4 0 -0.8 0 -1.2 1.2
8,000,000 256000 31 2 0 -0.8 1.6 -3.6 2.0
12,000,000 9600 1250 0 0 0 0 -0.05 0.05
12,000,000 19200 625 0 0 0 0 -0.2 0
12,000,000 38400 312 4 0 -0.2 0 -0.2 0.2
12,000,000 56000 214 2 0 -0.3 0.2 -0.4 0.5
424
Universal Serial Communication Interface, UART Mode SLAU144J–December 2004–Revised July 2013
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