WIZ820IO datasheet(8/15 Pages) ETC2

Part #	WIZ820IO

Description	WIZ820io User Manual

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WIZ820io User Manual

(WIZnet Co., Ltd.)

8

< Read Sequence >

/* Pseudo Code for Read data of 8bit per packet */

#define data_read_command

0x00

uint16 addr;

// Address : 16bits

int16 data_len;

// Data length :15bits

uint8 data_buf[]; // Array for data

SpiSendData();

// Send data from MCU to W5200

SpiRecvData();

// Receive data from W5200 to MCU

{

ISR_DISABLE(); // Interrupt Service Routine disable

CSoff(); // CS=0, SPI start

// SpiSendData

SpiSendData(((addr+idx) & 0xFF00) >> 8);

// Address byte 1

SpiSendData((addr+idx) & 0x00FF);

// Address byte 2

// Data write command + Data length upper 7bits

SpiSendData((data_read_command| ((data_len& 0x7F00) >> 8)));

// Data length bottom 8bits

SpiSendData((data_len& 0x00FF));

// Read data:On data_len> 1, Burst Read Processing Mode.

for(int idx = 0; idx<data_len; idx++)

{

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