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CLRC663 Datasheet(PDF) 25 Page - NXP Semiconductors

Part No. CLRC663
Description  Contactless reader IC
Download  132 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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CLRC663 Datasheet(HTML) 25 Page - NXP Semiconductors

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CLRC663
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 3 April 2012
171133
25 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
8.4.4.3
I2C 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.
8.4.4.4
I2C byte format
Each byte has to be followed by an acknowledge bit. Data is transferred with the MSB
first, see Figure 18 “START and STOP conditions”. The number of transmitted bytes
during one data transfer is unrestricted but shall fulfil the read/write cycle format.
Fig 17. Bit transfer on the I2C-bus.
001aam300
data line stable;
data valid
change
of data
allowed
SDA
SCL
Fig 18. START and STOP conditions
001aam301
START condition
S
SCL
SDA
SCL
SDA
STOP condition
P


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