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MFRC522 bảng dữ liệu(PDF) 53 Page - NXP Semiconductors

tên linh kiện MFRC522
Giải thích chi tiết về linh kiện  Contactless Reader IC
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nhà sản xuất  NXP [NXP Semiconductors]
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MFRC522 bảng dữ liệu(HTML) 53 Page - NXP Semiconductors

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© 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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