AT89C51SND2C-7FTUL Atmel, AT89C51SND2C-7FTUL Datasheet - Page 173

• Manufacturer Part Number: AT89C51SND2C-7FTUL
• Description: IC 8051 MCU FLASH 64K MP3 100BGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND2C-7FTUL

• 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: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b; D/A 2x20b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: ATAPI, I2S, IDE, SPI, UART, USB
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT89C51SND2C7FTUL

20.4.4
4341H–MP3–10/07
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 20-12 the selection is done using RBCK and TBCK bits in BDRCON register.
Figure 20-13 gives the baud rate calculation formulas for each baud rate source while Table 20-
2 details Internal Baud Rate Generator configuration for different peripheral clock frequencies
and giving baud rates closer to the standard baud rates.
Figure 20-12. Baud Rate Source Selection (Modes 1 and 3)
Figure 20-13. Baud Rate Formulas (Modes 1 and 3)
Baud_Rate=
BRL= 256 -
CLOCK
CLOCK
IBRG
T1
a. IBRG Formula
6
6
(1-SPD)
(1-SPD)
BDRCON.2
RBCK
2
2
SMOD1
SMOD1
⋅ 32 ⋅ (256 -BRL)
⋅ 32 ⋅ Baud_Rate
0
1
⋅ F
⋅ F
PER
PER
÷ 16
To Serial
Rx Port
AT8xC51SND2C/MP3B
CLOCK
CLOCK
IBRG
T1
Baud_Rate=
TH1= 256 -
BDRCON.3
TBCK
b. T1 Formula
0
1
6 ⋅ 32 ⋅ (256 -TH1)
192 ⋅ Baud_Rate
2
2
SMOD1
SMOD1
÷ 16
⋅ F
⋅ F
PER
PER
To Serial
Tx Port
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