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ENC28J60-C/SP 数据表(PDF) 27 Page - Microchip Technology |
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ENC28J60-C/SP 数据表(HTML) 27 Page - Microchip Technology |
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27 / 96 page  © 2006 Microchip Technology Inc. Preliminary DS39662B-page 25 ENC28J60 4.0 SERIAL PERIPHERAL INTERFACE (SPI) 4.1 Overview The ENC28J60 is designed to interface directly with the Serial Peripheral Interface (SPI) port available on many microcontrollers. The implementation used on this device supports SPI mode 0,0 only. In addition, the SPI port requires that SCK be at Idle in a low state; selectable clock polarity is not supported. Commands and data are sent to the device via the SI pin, with data being clocked in on the rising edge of SCK. Data is driven out by the ENC28J60 on the SO line, on the falling edge of SCK. The CS pin must be held low while any operation is performed and returned high when finished. FIGURE 4-1: SPI INPUT TIMING FIGURE 4-2: SPI OUTPUT TIMING CS SCK SI SO LSb In MSb In High-Impedance State CS SCK SO MSb Out LSb Out Don’t Care SI |
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