AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 139

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Table 124. Internal Baud Rate Generator Value
Notes:
Baud Rate Selection (Mode 2)
4109E–8051–06/03
Baud Rate
Baud Rate
115200
115200
57600
38400
19200
57600
38400
19200
9600
4800
9600
4800
1. These frequencies are achieved in X1 mode, F
2. These frequencies are achieved in X2 mode, F
SPD
SPD
1
1
1
1
1
1
1
1
1
-
-
-
SMOD1
SMOD1
F
F
PER
PER
1
1
1
1
1
1
1
1
1
-
-
-
= 12 MHz
= 6 MHz
BRL
BRL
246
236
217
178
243
236
217
178
100
In mode 2, the baud rate can only be programmed to 2 fixed values: 1/16 or 1/32 of the
peripheral clock frequency.
As shown in Figure 107 the selection is done using SMOD1 bit in PCON register.
Figure 108 gives the baud rate calculation formula depending on the selection.
Figure 107. Baud Rate Generator Selection (Mode 2)
-
-
-
(1)
(2)
Error %
Error %
2.34
2.34
0.16
0.16
0.16
2.34
0.16
0.16
0.16
-
-
-
CLOCK
PER
SPD
SPD
1
1
1
1
1
1
1
1
1
1
1
-
PER
PER
= F
= F
SMOD1
SMOD1
OSC
OSC
F
F
PER
PER
1
1
1
1
1
1
1
1
1
1
1
-
.
÷ 2.
= 16 MHz
= 8 MHz
÷ 2
BRL
BRL
247
243
230
204
152
247
239
230
204
152
48
-
(1)
(2)
SMOD1
PCON.7
0
1
Error %
Error %
3.55
0.16
0.16
0.16
0.16
3.55
2.12
0.16
0.16
0.16
0.16
-
÷ 16
SPD
SPD
1
1
1
1
1
1
1
1
1
1
1
-
AT8xC51SND1C
SMOD1
SMOD1
F
F
PER
PER
To Serial Port
1
1
1
1
1
1
1
1
1
1
0
-
= 10 MHz
= 20 MHz
BRL
BRL
245
240
223
191
126
245
234
223
191
126
126
-
(1)
(2)
Error %
Error %
1.36
1.73
1.36
0.16
0.16
1.36
1.36
1.36
0.16
0.16
0.16
-
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