Function description
Operating Manual PIT m4SEU
1004648-EN-02
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Flowchart for evaluating the Key ID interface
<ID
sync
> = 1
AND
<ID
response
> = 0
Increment Bit Counter
Set <IDrequest> = 0
Read Bit <ID
data
>
Start Timer
Set <ID
request
>= 1
Set Bit Counter = 0
Store ID Number
<ID
response
> = 1
No
<IDresponse> = 0
Time Control
<t
IDend
> >= 200ms
No
Bit Counter = 28
Start
[a]
[b]
[c]
[d]
[e]
Last Bit Control
Data Read and
Acknowledge
Bit Request
Requirement
See Fig.
„Timing diagram
of handshake controlled
signal transfer“:
See Fig.
„
State diagram
of handshake controlled
signal transfer“:
<IDsync> = 0
[g]
No
Yes
No
No
[f]
Fig.: Evaluation of the Key ID number via a controller (principle)
