ARM-Based Universal 1-Wire Module Solution

Table 2

Decision-making rules in 1-wire search algorithm.

First bit	Second bit	Situation
0	0	There are more devices on the bus. These devices have different values in their codes. There was a mismatch.
0	1	There are one or more devices on the bus. These devices have a bit with a value of 0 in their codes.
1	0	There are one or more devices on the bus. These devices have a bit of 1 in their codes.
1	1	There is no device on the bus that responds to the SEARCH command.