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AT89C5132-ROTUL Folha de dados(PDF) 113 Page - ATMEL Corporation

Nome de Peças AT89C5132-ROTUL
Descrição Electrónicos  USB Microcontroller with 64K Bytes Flash Memory
PDF  181 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5132-ROTUL Folha de dados(HTML) 113 Page - ATMEL Corporation

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4173D–USB–02/06
AT89C5132
Figure 18-13. Baud Rate Formulas (Modes 1 and 3)
Notes:
1. These frequencies are achieved in X1 mode, F
PER = FOSC ÷ 2.
2. These frequencies are achieved in X2 mode, F
PER = FOSC.
18.4.5
Baud Rate Selection
(Mode 2)
In mode 2, the baud rate can only be programmed to two fixed values: 1/16 or 1/32 of the periph-
eral clock frequency.
As shown in Figure 18-14 the selection is done using SMOD1 bit in PCON register.
Figure 18-15 gives the baud rate calculation formula depending on the selection.
Table 90. Baud Rate Generator Configuration
Baud
Rate
F
PER = 6 MHz
(1)
F
PER = 8 MHz
(1)
F
PER = 10 MHz
(1)
SPD
SMOD
1
BRL
Error
%SPD
SMOD
1BRL
Error
%
SPD
SMOD
1
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
SMOD
1
BRL
Error
%SPD
SMOD
1BRL
Error
%
SPD
SMOD
1
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
9600
1
1
178
0.16
1
1
152
0.16
1
1
126
0.16
4800
1
1
100
0.16
1
1
48
0.16
1
0
126
0.16
Baud_Rate=
6(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2SMOD1
⋅ F
PER
BRL= 256 -
6
(1-SPD)
⋅ 32 ⋅ Baud_Rate
2SMOD1
⋅ 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



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