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MFRC522 Datasheet(PDF) 53 Page - NXP Semiconductors |
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MFRC522 Datasheet(HTML) 53 Page - NXP Semiconductors |
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53 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 53 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 10.4.2 Data validity Data on the SDA line shall be stable during the HIGH period of the clock. The HIGH or LOW state of the data line shall only change when the clock signal on SCL is LOW. 10.4.3 START and STOP conditions To handle the data transfer on the I2C-bus, unique START (S) and STOP (P) conditions are defined. A START condition is defined with a HIGH to LOW transition on the SDA line while SCL is HIGH. A STOP condition is defined with a LOW to HIGH transition on the SDA line while SCL is HIGH. The master always generates the START and STOP conditions. The bus is considered to be busy after the START condition. The bus is considered to be free again a certain time after the STOP condition. The bus stays busy if a repeated START (Sr) is generated instead of a STOP condition. In this respect, the START (S) and repeated START (Sr) conditions are functionally identical. Therefore, the S symbol will be used as a generic term to represent both the START and repeated START (Sr) conditions. Fig 12. Bit transfer on the I2C-bus. Fig 13. START and STOP conditions. |
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