AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 54

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

14.5
54
UART Registers
AT89C51RD2/ED2
Table 14-5.
Table 14-6.
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.)
Table 14-7.
SADEN - Slave Address Mask Register for UART (B9h)
Reset Value = 0000 0000b
Table 14-8.
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
= 24MHz
= 24MHz
1
1
4235K–8051–05/08
Error (%)
Error (%)
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
3.55
0.16
-
0
0