Rainbow-electronics DS1904 Instrukcja Użytkownika Strona 3

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DS1904
3 of 12
HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2
DS1904
Command
Level
A
vailable
Commands
Data Fields
A
ffected
1-Wire Bus
Other
Devices
Bus
Master
DS1904
Function
(
see Fi
g
ure
Write
Read
RTC Counter
,
Device
RTC Counter
,
Device
Read
Match
Search
Ski
p
64-bit
64-bit
64-bit
N/
A
1-Wire ROM
Commands
(
see Fi
g
ure
64-BIT LASERED ROM Figure 3
MSB LSB
8-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (24h)
MSB LSB MSB LSB MSB LSB
1-WIRE CRC GENERATOR Figure 4
R
X
2
X
1
X
0
X
8
X
7
X
6
X
5
X
4
X
3
8TH
STAGE
7TH
STAGE
6TH
STAGE
5TH
STAGE
4TH
STAGE
3RD
STAGE
2ND
STAGE
1ST
STAGE
S
INPUT DATA
Polynomial = X
8
+ X
5
+ X
4
+ 1
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