C8051F300/1/2/3/4/5
Table 14.6. Timer Settings for Standard Baud Rates Using an External 3.6864 MHZ
Oscillator
Frequency: 3.6864 MHz
Target
Baud Rate
(bps)
230400
115200
SYSCLK from
External Osc.
57600
28800
14400
9600
2400
1200
230400
SYSCLK from
Internal Osc.
115200
57600
28800
14400
9600
Baud Rate
% Error
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
Oscillator Timer Clock
Divide
Source
Factor
16
32
64
128
256
384
1536
3072
16
32
64
128
256
384
SYSCLK
SYSCLK
SYSCLK
SYSCLK
SYSCLK
SYSCLK
SYSCLK / 12
SYSCLK / 12
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
SCA1–SCA0
(pre-scale
select)
1
XX
2
XX
2
XX
2
XX
2
XX
2
XX
2
00
00
11
11
11
11
11
11
T1M
1
Timer 1
Reload
Value (hex)
0xF8
0xF0
0xE0
0xC0
0x80
0x40
0xC0
0x80
0xFF
0xFE
0xFC
0xF8
0xF0
0xE8
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Notes:
1.
SCA1–SCA0 and T1M bit definitions can be found in
2.
X = Don’t care
138
Rev. 2.6
ETC [ ETC ]
