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AT83SND2CMP3 датащи(PDF) 69 Page - ATMEL Corporation

номер детали AT83SND2CMP3
подробное описание детали  Single-Chip MP3 Decoder with Full Audio Interface
PDF  97 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND2CMP3 датащи(HTML) 69 Page - ATMEL Corporation

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AT83SND2CMP3
7524B–MP3–05/06
Figure 60.
Transmission Waveforms (Mode 0)
Reception (Mode 0)
To start a reception in mode 0, write to SCON register clearing SM0, SM1 and RI bits
and setting the REN bit.
As shown in Figure 61, Clock is pulsed and the LSB (D0) is sampled on the RXD pin.
The D0 bit is then shifted into the shift register. After eight samplings, the MSB (D7) is
shifted into the shift register, and hardware asserts RI bit to indicate a completed recep-
tion. Software can then read the received Byte from SBUF register.
Figure 61.
Reception Waveforms (Mode 0)
Baud Rate Selection (Mode 0)
In mode 0, the baud rate can be either, fixed or variable.
As shown in Figure 62, the selection is done using M0SRC bit in BDRCON register.
Figure 63 gives the baud rate calculation formulas for each baud rate source.
Figure 62.
Baud Rate Source Selection (mode 0)
Figure 63.
Baud Rate Formulas (Mode 0)
Write to SBUF
TXD
RXD
TI
D0
D1
D2
D3
D4
D5
D6
D7
Write to SCON
TXD
RXD
RI
D0
D1
D2
D3
D4
D5
D6
D7
Set REN, Clear RI
0
1
M0SRC
BDRCON.0
PER
CLOCK
÷ 6
To Serial Port
IBRG
CLOCK
Baud_Rate=
6(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2
SMOD1
⋅ F
PER
BRL= 256
-
6(1-SPD)
⋅ 32 ⋅ Baud_Rate
2
SMOD1
⋅ F
PER
a. Fixed Formula
b. Variable Formula
Baud_Rate
=
6
FPER



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