C8051F336/7/8/9
Table 22.1. Timer Settings for Standard Baud Rates
Using The Internal 24.5 MHz Oscillator
Frequency: 24.5 MHz
1
Target
Baud Rate
(bps)
Baud Rate
% Error
Oscilla- Timer Clock
SCA1–SCA0
(pre-scale
Timer 1
Reload
Value (hex)
T1M
tor Divide
Factor
Source
1
select)
2
230400
115200
57600
28800
14400
9600
–0.32%
–0.32%
0.15%
–0.32%
0.15%
–0.32%
–0.32%
0.15%
106
212
426
SYSCLK
SYSCLK
SYSCLK
SYSCLK/4
SYSCLK/12
SYSCLK/12
SYSCLK/48
SYSCLK/48
1
1
1
0
0
0
0
0
0xCB
0x96
0x2B
0x96
0xB9
0x96
0x96
0x2B
XX
XX
XX
01
00
00
10
10
848
1704
2544
10176
20448
2400
1200
Notes:
1. SCA1–SCA0 and T1M bit definitions can be found in Section 24.1.
2. X = Don’t care.
Table 22.2. Timer Settings for Standard Baud Rates
Using an External 22.1184 MHz Oscillator
Frequency: 22.1184 MHz
1
Target
Baud Rate
(bps)
Baud Rate
% Error
Oscilla- Timer Clock
SCA1–SCA0
(pre-scale
Timer 1
Reload
Value (hex)
T1M
tor Divide
Factor
Source
1
select)
2
230400
115200
57600
28800
14400
9600
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%
96
192
384
SYSCLK
SYSCLK
SYSCLK
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0xD0
0xA0
0x40
0xE0
0xC0
0xA0
0xA0
0x40
0xFA
0xF4
0xE8
0xD0
0xA0
0x70
XX
XX
XX
00
00
00
10
10
11
11
11
11
11
11
768
SYSCLK / 12
SYSCLK / 12
SYSCLK / 12
SYSCLK / 48
SYSCLK / 48
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
EXTCLK / 8
1536
2304
9216
18432
96
192
384
768
1536
2304
2400
1200
230400
115200
57600
28800
14400
9600
Notes:
1. SCA1–SCA0 and T1M bit definitions can be found in Section 24.1.
2. X = Don’t care.
Rev. 0.2
173
SILICON [ SILICON ]
