AT89C51ED2-RDTIM datasheet(55/137 Pages) ATMEL

55 / 137 page

AT89C51RD2/ED2

4235E–8051–04/04

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

Table 35. 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 25.), 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)

Reset Value = 0000 0000b

Table 37. SADDR Register

SADDR - Slave Address Register for UART (A9h)

Reset Value = 0000 0000b

Baud Rates

FOSC = 16. 384 MHz

FOSC = 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

1.23

Baud Rates

FOSC = 16. 384 MHz

FOSC = 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

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