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AT80SND1C-ROTIL Datasheet(PDF) 139 Page - ATMEL Corporation

Part # AT80SND1C-ROTIL
Description  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  210 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT80SND1C-ROTIL Datasheet(HTML) 139 Page - ATMEL Corporation

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139
AT8xC51SND1C
4109E–8051–06/03
Notes:
1. These frequencies are achieved in X1 mode, F
PER = FOSC ÷ 2.
2. These frequencies are achieved in X2 mode, F
PER = FOSC.
Baud Rate Selection (Mode 2)
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)
Table 124. 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
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
0
1
SMOD1
PCON.7
PER
CLOCK
÷ 2
÷ 16
To Serial Port



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