Maxim Integrated DS21Q55 - Manual (Page 38)

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6. PROGRAMMING MODEL
The DS21Q55 register map is divided into three groups: T1 specific features, E1 specific features, and
common features. The typical programming sequence begins with issuing a reset to the device, selecting
T1 or E1 operation in the master mode register, enabling T1 or E1 functions, and enabling the common
functions. The act of resetting the device automatically clears all configuration and status registers.
Therefore, it is not necessary to load unused registers with zeros.
PROGRAMMING SEQUENCE Figure 8-1
Power-On
Issue Reset
Select T1 or E1 Operation in Master Mode Register
Program T1 Specific Registers Program E1 Specific Registers
Program Common Registers
DS21Q55 Operational