AT80C51RD2 Atmel Corporation, AT80C51RD2 Datasheet - Page 40

• Manufacturer Part Number: AT80C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT80C51RD2

• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Watchdog: Yes

11.4
40
UART Registers
AT80C51RD2
Table 11-5.
Table 11-6.
The baud rate generator can be used for mode 1 or 3 (see Figure 11-4.), but also for mode 0 for
UART, thanks to the bit SRC located in BDRCON register (Table 11-13.)
Table 11-7.
SADEN - Slave Address Mask Register for UART (B9h)
Reset Value = 0000 0000b
Table 11-8.
SADDR - Slave Address Register for UART (A9h)
Reset Value = 0000 0000b
Baud Rates
Baud Rates
7
7
115200
57600
38400
28800
19200
9600
4800
4800
2400
1200
600
Example of Computed Value when X2 = 1, SMOD1 = 1, SPD = 1
Example of Computed Value when X2 = 0, SMOD1 = 0, SPD = 0
SADEN Register
SADDR Register
6
6
BRL
BRL
247
238
229
220
203
149
247
238
220
185
43
5
5
F
F
OSC
OSC
=16.384 MHz
=16.384 MHz
4
4
Error (%)
Error (%)
1.23
1.23
1.23
1.23
0.63
0.31
1.23
1.23
1.23
1.23
0.16
3
3
BRL
BRL
2
2
243
230
217
204
178
100
243
230
202
152
-
F
F
OSC
OSC
=24 MHz
=24 MHz
1
1
4113D–8051–01/09
Error (%)
Error (%)
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
3.55
0.16
-
0
0