Specifications

C8051F330/1
152 Rev. 1.1
Table 16.1. Timer Settings for Standard Baud Rates Using The Internal Oscillator
Frequency: 24.5 MHz
Target
Baud Rate
(bps)
Baud Rate
% Error
Oscillator
Divide
Factor
Timer Clock
Source
SCA1-SCA0
(pre-scale select)
†
T1M
†
Timer 1
Reload
Value (hex )
SYSCLK from
Internal Osc.
230400 -0.32% 106 SYSCLK XX 1 0xCB
115200 -0.32% 212 SYSCLK XX 1 0x96
57600 0.15% 426 SYSCLK XX 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
X = Don’t care
†
SCA1-SCA0 and T1M bit definitions can be found in Section 18.1.
Tabl e 16.2. Timer Settings for Standard Baud Rates Using an External Oscillator
Frequency: 25.0 MHz
Target
Baud Rate
(bps)
Baud Rate
% Error
Oscillator
Divide
Factor
Timer Clock
Source
SCA1-SCA0
(pre-scale select)
†
T1M
†
Timer 1
Reload
Value (hex )
SYSCLK from
External Osc.
230400 -0.47% 108 SYSCLK XX 1 0xCA
115200 0.45% 218 SYSCLK XX 1 0x93
57600 -0.01% 434 SYSCLK XX 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
SYSCLK from
Internal Osc.
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
X = Don’t care
†
SCA1-SCA0 and T1M bit definitions can be found in Section 18.1.