WIZ820io WIZnet, WIZ820io Datasheet - Page 9

• Manufacturer Part Number: WIZ820io
• Description: Ethernet Modules W5200 & MAG JACK ioPLATFORM MODULE
• Manufacturer: WIZnet

Specifications of WIZ820io

• Rohs: yes
• Product: Serial to Ethernet Modules
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Dimensions: 23 mm x 25 mm
• Minimum Operating Temperature: - 40 C

3.3 Write processing
The WRITE processing is entered by driving nSS low, followed by the Address, the
OP code, the Data Length, and the Data byte on MISO.
In W5200 SPI mode, the Byte WRITE processing and the Burst WRITE processing
are provided. The Byte WRITE processing takes 4 instructions which is consist of
the 16-bit Address, the 1-bit OP code(0x1), the 15-bit Data length and 8-bit Data.
Otherwise, The Burst WRITE processing only takes the Data instruction after the
setting of the Burst WRITE processing. To distinguish between the Byte WRITE and
the Burst WRITE processing, the Data length is used. If the Data length is ‘1,’ the
Byte WRITE processing is operated. Otherwise, the Burst WRITE Processing is
operated when the Data length is more than two. The MOSI pin should be selected
by driving MOSI low after the falling edge of the nSS.
WIZ820io User Manual
}
CSon();
ISR_ENABLE();
}
SpiSendData(0);
data_buf[idx] = SpiRecvData(idx);
// CS=1, SPI end
// Interrupt Service Routine disable
(WIZnet Co., Ltd.)
// Dummy data
< Write Sequence >
// Read data
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