AT80C51SND1C-ROTUL Atmel, AT80C51SND1C-ROTUL Datasheet - Page 139

• Manufacturer Part Number: AT80C51SND1C-ROTUL
• Description: IC MCU FLASH MP3 DECODER 80-TQFP
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51SND1C-ROTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 44
• Program Memory Type: ROMless
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

18.4.4
Table 125. Internal Baud Rate Generator Value
4109L–8051–02/08
Baud Rate
Baud Rate
115200
115200
57600
38400
19200
57600
38400
19200
9600
4800
Baud Rate Selection (Modes 1 and 3)
SPD
SPD
1
1
1
1
1
1
1
-
-
-
SMOD1
SMOD1
F
F
PER
PER
1
1
1
1
1
1
1
-
-
-
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 18-12 the selection is done using RBCK and TBCK bits in BDRCON register.
Figure 18-13 gives the baud rate calculation formulas for each baud rate source while Table 125
details Internal Baud Rate Generator configuration for different peripheral clock frequencies and
giving baud rates closer to the standard baud rates.
Figure 18-12. Baud Rate Source Selection (Modes 1 and 3)
Figure 18-13. Baud Rate Formulas (Modes 1 and 3)
= 12 MHz
= 6 MHz
Baud_Rate=
BRL
BRL
BRL= 256 -
246
236
217
178
243
236
217
-
-
-
(1)
(2)
CLOCK
CLOCK
IBRG
T1
Error %
Error %
a. IBRG Formula
2.34
2.34
0.16
0.16
0.16
2.34
0.16
-
-
-
6
6
(1-SPD)
(1-SPD)
BDRCON.2
RBCK
2
2
SMOD1
SMOD1
⋅ 32 ⋅ (256 -BRL)
⋅ 32 ⋅ Baud_Rate
0
1
SPD
SPD
1
1
1
1
1
1
1
1
1
-
⋅ F
⋅ F
PER
PER
SMOD1
SMOD1
÷ 16
F
F
PER
PER
1
1
1
1
1
1
1
1
1
-
= 16 MHz
= 8 MHz
To Serial
Rx Port
BRL
BRL
247
243
230
204
152
247
239
230
204
-
(1)
(2)
Error %
Error %
3.55
0.16
0.16
0.16
0.16
3.55
2.12
0.16
0.16
CLOCK
CLOCK
-
IBRG
T1
Baud_Rate=
SPD
SPD
TH1= 256 -
1
1
1
1
1
1
1
1
1
-
AT8xC51SND1C
BDRCON.3
TBCK
b. T1 Formula
0
1
SMOD1
SMOD1
F
F
PER
PER
1
1
1
1
1
1
1
1
1
-
6 ⋅ 32 ⋅ (256 -TH1)
192 ⋅ Baud_Rate
2
2
= 10 MHz
= 20 MHz
SMOD1
SMOD1
÷ 16
BRL
BRL
245
240
223
191
126
245
234
223
191
⋅ F
⋅ F
-
(1)
(2)
PER
PER
To Serial
Tx Port
Error %
Error %
1.36
1.73
1.36
0.16
0.16
1.36
1.36
1.36
0.16
-
139