C8051F300 Datasheet, PDF (136/176 Pages) List of Unclassifed Manufacturers – Mixed Signal ISP Flash MCU Family

C8051F300/1/2/3/4/5
Table 14.1. Timer Settings for Standard Baud Rates Using The Internal 24.5 MHz
Oscillator
Frequency: 24.5 MHz
Target
Baud Rate
(bps)
230400
115200
57600
Baud Rate Oscillator Timer Clock
% Error
Divide
Source
Factor
–0.32%
106
SYSCLK
–0.32%
212
SYSCLK
0.15%
426
SYSCLK
SCA1–SCA0
(pre-scale
select)¹
XX²
XX²
XX²
T1M^{1 Timer 1}
Reload
Value (hex)
1
0xCB
1
0x96
1
0x2B
28800
–0.32%
848
SYSCLK / 4
01
0
0x96
14400
0.15%
1704 SYSCLK / 12
00
0
0xB9
9600
–0.32%
2544 SYSCLK / 12
00
0
0x96
2400
–0.32%
10176 SYSCLK / 48
10
0
0x96
1200
0.15%
20448 SYSCLK / 48
10
0
0x2B
Notes:
1. SCA1-SCA0 and T1M bit definitions can be found in Section 15.1.
2. X = Don’t care.
Table 14.2. Timer Settings for Standard Baud Rates Using an External 25 MHz
Oscillator
Frequency: 25.0 MHz
Target
Baud Rate
(bps)
Baud Rate Oscillator Timer Clock
% Error Divide
Source
Factor
230400
–0.47%
108
SYSCLK
115200
0.45%
218
SYSCLK
57600
–0.01%
434
SYSCLK
SCA1–SCA0
(pre-scale
select)¹
XX²
XX²
XX²
T1M^{1 Timer 1}
Reload
Value (hex)
1
0xCA
1
0x93
1
0x27
28800
0.45%
872
SYSCLK / 4
01
0
0x93
14400
–0.01%
1736 SYSCLK / 4
01
0
0x27
9600
0.15%
2608 EXTCLK / 8
11
0
0x5D
2400
0.45%
10464 SYSCLK / 48
10
0
0x93
1200
–0.01%
20832 SYSCLK / 48
10
0
0x27
57600
–0.47%
432
EXTCLK / 8
11
0
0xE5
28800
–0.47%
864
EXTCLK / 8
11
0
0xCA
14400
0.45%
1744 EXTCLK / 8
11
0
0x93
9600
0.15%
2608 EXTCLK / 8
11
0
0x5D
Notes:
1. SCA1–SCA0 and T1M bit definitions can be found in Section 15.1.
2. X = Don’t care
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Rev. 2.8