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AT83SND1CXXX-ROTIL Datenblatt(PDF) 138 Page - ATMEL Corporation

Teilenummer AT83SND1CXXX-ROTIL
Bauteilbeschribung  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTIL Datenblatt(HTML) 138 Page - ATMEL Corporation

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4109J–8051–10/06
AT8xC51SND1C
17.4.4
Baud Rate Selection (Modes 1 and 3)
In modes 1 and 3, the Baud Rate is derived either from the Timer 1 or the Internal Baud Rate
Generator and allows different baud rate in reception and transmission.
As shown in Figure 17-12 the selection is done using RBCK and TBCK bits in BDRCON register.
Figure 17-13 gives the baud rate calculation formulas for each baud rate source while Table 114
details Internal Baud Rate Generator configuration for different peripheral clock frequencies and
giving baud rates closer to the standard baud rates.
Figure 17-12. Baud Rate Source Selection (Modes 1 and 3)
Figure 17-13. Baud Rate Formulas (Modes 1 and 3)
0
1
RBCK
BDRCON.2
T1
CLOCK
To Serial
IBRG
CLOCK
Rx Port
0
1
TBCK
BDRCON.3
T1
CLOCK
To Serial
IBRG
CLOCK
Tx Port
÷ 16
÷ 16
Baud_Rate=
6
(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2
SMOD1
⋅ F
PER
BRL= 256 -
6(1-SPD)
⋅ 32 ⋅ Baud_Rate
2
SMOD1
⋅ F
PER
Baud_Rate=
6
⋅ 32 ⋅ (256 -TH1)
2SMOD1
⋅ F
PER
TH1= 256 -
192
⋅ Baud_Rate
2
SMOD1
⋅ F
PER
a. IBRG Formula
b. T1 Formula
Table 114. Internal Baud Rate Generator Value
Baud Rate
F
PER = 6 MHz
(1)
F
PER = 8 MHz
(1)
F
PER = 10 MHz
(1)
SPD
SMOD1
BRL
Error %
SPD
SMOD1
BRL
Error %
SPD
SMOD1
BRL
Error %
115200
-----
-------
57600
----
1
1
247
3.55
1
1
245
1.36
38400
1
1
246
2.34
1
1
243
0.16
1
1
240
1.73
19200
1
1
236
2.34
1
1
230
0.16
1
1
223
1.36
9600
1
1
217
0.16
1
1
204
0.16
1
1
191
0.16
4800
1
1
178
0.16
1
1
152
0.16
1
1
126
0.16
Baud Rate
F
PER = 12 MHz
(2)
F
PER = 16 MHz
(2)
F
PER = 20 MHz
(2)
SPD
SMOD1
BRL
Error %
SPD
SMOD1
BRL
Error %
SPD
SMOD1
BRL
Error %
115200
----
1
1
247
3.55
1
1
245
1.36
57600
1
1
243
0.16
1
1
239
2.12
1
1
234
1.36
38400
1
1
236
2.34
1
1
230
0.16
1
1
223
1.36
19200
1
1
217
0.16
1
1
204
0.16
1
1
191
0.16



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