ABRIDGED DATA SHEET
DS2465
SHA-256 Coprocessor with 1-Wire Master Function
2
I C Communication Examples (continued)
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed
Repeat until the
1WB bit has
S
AD,0
A
60h
A
1WRB
A
changed to 0.
Sr AD,1 A <byte> A <byte> A\
Sr AD,0
A 62h A Sr AD,1 A <byte> A\ P
Poll the Status register until the 1WB bit has changed from 1 to 0. Then set the read address to the 1-Wire Read
Data register and access the device again to read the data byte that was obtained from the 1-Wire line.
Case C: 1-Wire Busy (1WB = 1)
S
AD,0
A
60h
A
1WRB A\ P
The master should stop and restart as soon as the DS2465 does not acknowledge the command code.
1-Wire Triplet% e.g.% to Perform a Search ROM Function on the 1-Wire Line
Case A: 1-Wire Idle (1WB = 0), No Busy Polling
S
AD,0
A
60h
A
1WT
A
<byte>
A
P
(Idle)
S
AD,1 A <byte> A\ P
The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the result
from the 1-Wire Triplet command.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed
Repeat until the
1WB bit has
S
AD,0 A 60h A 1WT A <byte> A
changed to 0.
Sr AD,1 A <byte> A <byte> A\
P
When 1WB has changed from 1 to 0, the 1-Wire Master Status register holds the valid result of the 1-Wire Triplet
command.
Case C: 1-Wire Busy (1WB = 1)
S
AD,0 A 60h A 1WT A\ P
The master should stop and restart as soon as the DS2465 does not acknowledge the command code.
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