User's Manual

StrongLink SL030 3.1
http://www.stronglink-rfid.com
5
3. Device Operation
3-1. Clock and Data Transitions:
The SDA pin is normally pulled high with an external device. Data on the SDA pin may
change only during SCL low time periods. Data changes during SCL high periods will
indicate a start or stop condition as defined below.
3-2. Start Condition
A high-to-low transition of SDA with SCL high is a start condition which must precede any
other command
3-3. Stop Condition
A low-to-high transition of SDA with SCL high is a stop condition.
3-4. Acknowledge
All addresses and data words are serially transmitted to and from the SL030 in 8-bit words.
The SL030 sends a zero to acknowledge that it is not busy, and has received each word.
This happens during the ninth clock cycle.