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C8051T620/1/6/7 & C8051T320/1/2/3
Baud Rate
A quick reference for typical baud rates and system clock frequencies is given in Table 26.1.
Table 26.1. Baud Rate Generator Settings for Standard Baud Rates
Target Baud
Actual Baud
Rate (bps)
Rate (bps)
230400
230769
115200
115385
57600
28800
14400
9600
2400
1200
230400
230769
115200
115385
57600
28800
14400
9600
2400
1200
230400
230769
115200
115385
57600
28800
14400
9600
2400
1200
224
SYSCLK
-------------------------------------------------------------------------- -
=
65536 (SBRLH1:SBRLL1)
–
Equation 26.1. UART1 Baud Rate
Baud Rate
Error
0.16%
0.16%
57692
0.16%
28846
0.16%
14388
0.08%
9600
0.0%
2400
0.0%
1200
0.0%
0.16%
0.16%
57692
0.16%
28777
0.08%
14406
0.04%
9600
0.0%
2400
0.0%
1200
0.0%
0.16%
0.16%
57554
0.08%
28812
0.04%
14397
0.02%
9600
0.0%
2400
0.0%
1200
0.0%
Rev. 1.2
1
-- -
--------------------- -
2
Prescaler
Oscillator
SB1PS[1:0]
Divide
(Prescaler Bits)
Factor
52
11
104
11
208
11
416
11
834
11
1250
11
5000
11
10000
11
104
11
208
11
416
11
834
11
1666
11
2500
11
10000
11
20000
11
208
11
416
11
834
11
1666
11
3334
11
5000
11
20000
11
40000
11
1
Reload Value in
SBRLH1:SBRLL1
0xFFE6
0xFFCC
0xFF98
0xFF30
0xFE5F
0xFD8F
0xF63C
0xEC78
0xFFCC
0xFF98
0xFF30
0xFE5F
0xFCBF
0xFB1E
0xEC78
0xD8F0
0xFF98
0xFF30
0xFE5F
0xFCBF
0xF97D
0xF63C
0xD8F0
0xB1E0
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