Table 34. Example of Computed Value When X2=1, SMOD1=1, SPD=1
Baud Rates
FOSC = 16. 384 MHz
FOSC = 24MHz
Error (%)
BRL
Error (%)
1.23
BRL
243
230
217
204
178
100
-
115200
57600
38400
28800
19200
9600
247
238
229
220
203
149
43
0.16
0.16
0.16
0.16
0.16
0.16
-
1.23
1.23
1.23
0.63
0.31
4800
1.23
Table 35. Example of Computed Value When X2=0, SMOD1=0, SPD=0
Baud Rates
F
BRL
247
238
220
185
OSC = 16. 384 MHz
FOSC = 24MHz
Error (%)
BRL
243
230
202
152
Error (%)
0.16
4800
2400
1200
600
1.23
1.23
1.23
0.16
0.16
3.55
0.16
The baud rate generator can be used for mode 1 or 3 (refer to Figure 20.), but also for
mode 0 for UART, thanks to the bit SRC located in BDRCON register (Table 42.)
UART Registers
Table 36. SADEN Register
SADEN - Slave Address Mask Register for UART (B9h)
7
6
5
4
3
2
1
0
Reset Value = 0000 0000b
Table 37. SADDR Register
SADDR - Slave Address Register for UART (A9h)
7
6
5
4
3
2
1
0
Reset Value = 0000 0000b
50
AT89C51RB2/RC2
4180C–8051–12/03
ATMEL [ ATMEL ]
