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W5200 bảng dữ liệu(PDF) 73 Page - WIZnet Co., Ltd

tên linh kiện W5200
Giải thích chi tiết về linh kiện  Microcontroller
PDF  88 Pages
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nhà sản xuất  WIZNET [WIZnet Co., Ltd]
Trang chủ  https://www.wiznet.io/ko/Product/
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6
External Interface
For the communication with MCU, W5200 provides SPI I/F modes. For the communication
with Ethernet PHY, MII is used.
6.1 SPI (Serial Peripheral Interface) mode
Serial Peripheral Interface Mode uses only four pins for data communication.
Four pins are CSn, SCLK, MOSI, and MISO.
Figure 18 SPI Interface
6.2 Device Operations
W5200 is controlled by a set of instruction that is sent from a external host , commonly
referred to as the SPI Master. The SPI Master communicates with W5200 via the SPI bus,
which is composed of four signal lines: Slave Chip Select (CSn), Serial Clock (SCLK), MOSI
(Master Out Slave In) and MISO (Master In Slave Out).
The SPI protocol defines four modes for its operation (Mode 0-3). Each mode differs
according to the SCLK polarity and phase - how the polarity and phase control the flow of
data on the SPI bus. The W5200 operates as SPI Slave device and supports the most common
modes - SPI Mode 0 and 3.
The only difference between SPI Mode 0 and 3 is the polarity of the SCLK signal at the
inactive state. With SPI Mode 0 and 3, data is always latched in on the rising edge of SCLK
and always output on the falling edge of SCLK.



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