Datasheet

54
4235K–8051–05/08
AT89C51RD2/ED2
Table 14-5. Example of Computed Value When X2=1, SMOD1=1, SPD=1
Table 14-6. Example of Computed Value When X2=0, SMOD1=0, SPD=0
The baud rate generator can be used for mode 1 or 3 (refer to Figure 14-4.), but also for mode 0
for UART, thanks to the bit SRC located in BDRCON register (Table 14-13.)
14.5 UART Registers
Table 14-7. SADEN Register
SADEN - Slave Address Mask Register for UART (B9h)
Reset Value = 0000 0000b
Table 14-8. SADDR Register
SADDR - Slave Address Register for UART (A9h)
Reset Value = 0000 0000b
Baud Rates F
OSC
= 16. 384 MHz F
OSC
= 24MHz
BRL Error (%) BRL Error (%)
115200 247 1.23 243 0.16
57600 238 1.23 230 0.16
38400 229 1.23 217 0.16
28800 220 1.23 204 0.16
19200 203 0.63 178 0.16
9600 149 0.31 100 0.16
4800 43 1.23 - -
Baud Rates F
OSC
= 16. 384 MHz F
OSC
= 24MHz
BRL Error (%) BRL Error (%)
4800 247 1.23 243 0.16
2400 238 1.23 230 0.16
1200 220 1.23 202 3.55
600 185 0.16 152 0.16
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0