AT89C51RC2-3CSCM(2003) 查看數據表（PDF） - Atmel Corporation

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AT89C51RC2-3CSCM
(Rev.:2003)

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

UART Registers

Table 34. Example of Computed Value When X2 = 1, SMOD1 = 1, SPD = 1

Baud Rates

115200

57600

38400

28800

19200

9600

4800

FOSC = 16. 384 MHz

BRL

Error (%)

247

1.23

238

1.23

229

1.23

220

1.23

203

0.63

149

0.31

43

1.23

FOSC = 24MHz

BRL

Error (%)

243

0.16

230

0.16

217

0.16

204

0.16

178

0.16

100

0.16

-

-

Table 35. Example of Computed Value When X2 = 0, SMOD1 = 0, SPD = 0

Baud Rates

4800

2400

1200

600

FOSC = 16. 384 MHz

BRL

Error (%)

247

1.23

238

1.23

220

1.23

185

0.16

FOSC = 24MHz

BRL

Error (%)

243

0.16

230

0.16

202

3.55

152

0.16

The baud rate generator can be used for mode 1 or 3 (see Figure 19), but also for mode

0 for UART, thanks to the bit SRC located in BDRCON register (Table 42).

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

48 AT89C51RB2/RC2

4180B–8051–04/03

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