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AT89C5122D-RDRUM датащи(PDF) 132 Page - ATMEL Corporation

номер детали AT89C5122D-RDRUM
подробное описание детали  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM датащи(HTML) 132 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
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 peripheral clock frequency.
As shown in Figure 80 the selection is done using SMOD1 bit in PCON register.
Figure 81 gives the baud rate calculation formula depending on the selection.
Figure 80.
Baud Rate Generator Selection (Mode 2)
Figure 81.
Baud Rate Formula (Mode 2)
For mode 0 for UART, thanks to the bit M0SRC located in BDRCON register (Table 82)
Table 76.
Internal Baud Rate Generator Value
Baud Rate
F
CK_IDLE= 4 MHz
F
CK_IDLE= 8 MHz
F
CK_IDLE= 9.6 MHz
SPD
SMOD1
BRL
Error%
SPD
SMOD1
BRL
Error%
SPD
SMOD1
BRL
Error%
115200
1
1
254
8.51
1
1
252
8.51
1
1
251
4.17
57600
1
1
252
8.51
1
1
247
3.55
1
1
246
4.17
38400
1
1
249
6.99
1
1
243
0.16
1
1
240
2.34
19200
1
1
243
0.16
1
1
230
0.16
1
1
225
0.81
9600
1
1
230
0.16
1
1
204
0.16
1
1
194
0.81
4800
1
1
204
0.16
1
1
152
0.16
1
1
131
0.00
Baud Rate
F
CK_IDLE= 12 MHz
F
CK_IDLE= 16 MHz
F
CK_IDLE= 24 MHz
SPD
SMOD1
BRL
Error%
SPD
SMOD1
BRL
Error%
SPD
SMOD1
BRL
Error%
115200
1
1
249
6.99
1
1
247
3.55
1
1
243
0.16
57600
1
1
243
0.16
1
1
239
2.12
1
1
230
0.16
38400
1
1
236
2.34
1
1
230
0.16
1
1
217
0.16
19200
1
1
217
0.16
1
1
204
0.16
1
1
178
0.16
9600
1
1
178
0.16
1
1
152
0.16
1
1
100
0.16
4800
1
1
100
0.16
1
1
48
0.16
1
1
N/A
N/A
1
0
SMOD1
PCON.7
CK_
SI
x2
/32
To Serial Port
Baud_Rate =
32
2
SMOD1
⋅ F
CK_SI



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