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ADSP-BF522BBCZ-4A Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer ADSP-BF522BBCZ-4A
Bauteilbeschribung  Blackfin Embedded Processor
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ADSP-BF522BBCZ-4A Datenblatt(HTML) 11 Page - Analog Devices

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Rev. D
|
Page 11 of 88
|
July 2013
ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
• Bidirectional operation — Each SPORT has two sets of
independent transmit and receive pins, enabling eight
channels of I2S stereo audio.
• Buffered (8-deep) transmit and receive ports — Each port
has a data register for transferring data words to and from
other processor components and shift registers for shifting
data in and out of the data registers.
• Clocking — Each transmit and receive port can either use
an external serial clock or generate its own, in frequencies
ranging from (fSCLK/131,070) Hz to (fSCLK/2) Hz.
• Word length – Each SPORT supports serial data words
from 3 to 32 bits in length, transferred most-significant-bit
first or least-significant-bit first.
• Framing — Each transmit and receive port can run with or
without frame sync signals for each data word. Frame sync
signals can be generated internally or externally, active high
or low, and with either of two pulse widths and early or late
frame sync.
• Companding in hardware — Each SPORT can perform
A-law or μ-law companding according to ITU recommen-
dation G.711. Companding can be selected on the transmit
and/or receive channel of the SPORT without
additional latencies.
• DMA operations with single-cycle overhead — Each
SPORT can automatically receive and transmit multiple
buffers of memory data. The processor can link or chain
sequences of DMA transfers between a SPORT and
memory.
• Interrupts — Each transmit and receive port generates an
interrupt upon completing the transfer of a data word or
after transferring an entire data buffer, or buffers,
through DMA.
• Multichannel capability — Each SPORT supports 128
channels out of a 1024-channel window and is compatible
with the H.100, H.110, MVIP-90, and HMVIP standards.
SERIAL PERIPHERAL INTERFACE (SPI) PORT
The processors have an SPI-compatible port that enables the
processor to communicate with multiple SPI-compatible
devices.
The SPI interface uses three pins for transferring data: two data
pins (Master Output-Slave Input, MOSI, and Master Input-
Slave Output, MISO) and a clock pin (serial clock, SCK). An SPI
chip select input pin (SPISS) lets other SPI devices select the
processor, and seven SPI chip select output pins (SPISEL7–1) let
the processor select other SPI devices. The SPI select pins are
reconfigured general-purpose I/O pins. Using these pins, the
SPI port provides a full-duplex, synchronous serial interface,
which supports both master/slave modes and multimaster
environments.
The SPI port’s baud rate and clock phase/polarities are pro-
grammable, and it has an integrated DMA channel,
configurable to support transmit or receive data streams. The
SPI’s DMA channel can only service unidirectional accesses at
any given time.
The SPI port’s clock rate is calculated as:
Where the 16-bit SPI_BAUD register contains a value of 2
to 65,535.
During transfers, the SPI port simultaneously transmits and
receives by serially shifting data in and out on its two serial data
lines. The serial clock line synchronizes the shifting and sam-
pling of data on the two serial data lines.
UART PORTS
The processors provide two full-duplex universal asynchronous
receiver/transmitter (UART) ports, which are fully compatible
with PC-standard UARTs. Each UART port provides a simpli-
fied UART interface to other peripherals or hosts, supporting
full-duplex, DMA-supported, asynchronous transfers of serial
data. A UART port includes support for five to eight data bits,
one or two stop bits, and none, even, or odd parity. Each UART
port supports two modes of operation:
• PIO (programmed I/O) — The processor sends or receives
data by writing or reading I/O mapped UART registers.
The data is double-buffered on both transmit and receive.
• DMA (direct memory access) — The DMA controller
transfers both transmit and receive data. This reduces the
number and frequency of interrupts required to transfer
data to and from memory. The UART has two dedicated
DMA channels, one for transmit and one for receive. These
DMA channels have lower default priority than most DMA
channels because of their relatively low service rates.
Each UART port's baud rate, serial data format, error code gen-
eration and status, and interrupts are programmable:
• Supporting bit rates ranging from (fSCLK/1,048,576) to
(fSCLK/16) bits per second.
• Supporting data formats from seven to 12 bits per frame.
• Both transmit and receive operations can be configured to
generate maskable interrupts to the processor.
The UART port’s clock rate is calculated as:
Where the 16-bit UART_Divisor comes from the UART_DLH
(most significant 8 bits) and UART_DLL (least significant
8 bits) registers.
In conjunction with the general-purpose timer functions, auto-
baud detection is supported.
The capabilities of the UARTs are further extended with sup-
port for the infrared data association (IrDA®) serial infrared
physical layer link specification (SIR) protocol.
SPI Clock Rate
fSCLK
2
SPI_BAUD
------------------------------------
=
UART Clock Rate
f
SCLK
16
UART_Divisor
-----------------------------------------------
=


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