SCS152 View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'SCS152' PDF : 16 Pages View PDF
SCS152
6.0 PERSONALIZATION
During the typical life of the device, it must be person-
alized. The following procedure personalizes the
device:
1. Issue a RESET command.
2. Issue 147 RDBIT commands.
3. Issue 64 PUTBIT commands to present the
transport code.
4. Issue 88 RDBIT commands.
5. Program the SER field by issuing BITPROG
commands at the appropriate addresses.
6. Decrement each digit in the token counter to the
proper value by issuing BITPROG and RDBIT
commands as needed.
7. Program the USER area.
8. Program the UKEY0 area by clocking to the first
bit of each byte (i.e., addresses 148, 156,
164, …) issuing BITPROG and ERASE com-
mands, and then programming the byte with
BITPROG commands.
9. Check the contents via the signature function.
10. Set the device to user mode by issuing
a BITPROG commands at addresses 104 and
105.
Note:
The internal transport code OK status bit is
reset by the RESET command or when the
device is no longer in issuer mode (which
happens when PC0 and PC1 are pro-
grammed).
7.0 MEMORY CONTENTS
7.1 Shipped Devices
Field Name
CID
SER
ISS
D4
D3
D2
D1
D0
CFG
USER0
UKEY0
Contents
Chip identification data
all 1
1
all 1
all 1
all 1
all 1
all 1
PC0 = 0, PC1 = 1, LOCK0 = 1
All 1
Transport code
7.2 After Personalization
Field Name
Contents
CID
SER
ISS
D4
D3
D2
Chip identification data
Device serial number
0
Digit 4 of counter
Digit 3 of counter
Digit 2 of counter
D1
D0
CFG
USER0
UKEY0
Digit 1 of counter
Digit 0 of counter
PC0 = 1, PC1 = 0,
LOCK0 = 1/0 depending on application
All 1
Transport code
DS40150B-page 12
Preliminary
© 1997 Microchip Technology Inc.
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