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MFRC522 Datasheet(PDF) 90 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 90 Page - NXP Semiconductors |
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90 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 90 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 23.8 Timing for the SPI compatible interface Table 174: Timing Specification for SPI Symbol Parameter Conditions Min Typ Max Unit tSCKL SCK low pulse width 50 - ns tSCKH SCK high pulse width 50 - ns tSHDX SCK high to data changes 25 - ns tDXSH data changes to SCK high 25 - ns tSLDX SCK low to data changes - 25 ns tSLNH SCK low to NSS high 0 - ns Remark: The signal NSS has to be low to be able to send several bytes in one datastream. To send more than one datastream NSS has to be set to HIGH level in between the data streams. Fig 30. Timing Diagram for SPI. SCK MOSI NSS MISO t SCKL t SCKL t SCKH t SHDX t DXSH MSB LSB MSB LSB t SLDX t DXSH t SLNH |
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