AT88SC1616CRF View Datasheet(PDF) - Atmel Corporation
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MFG CO.
'AT88SC1616CRF' PDF : 158 Pages View PDF
AT88SC0808/1616/3216/6416CRF, AT88RF04C
The three Communication Security Mode control bits: AM0, AM1, and ER control the communication security
requirements for the User Zone as shown in Table 65. By default authentication and encryption communication security
are disabled. See Appendix K for information on Encryption Communication Security.
Table 65. Communication Security Mode options for 88SC PICCs.
AM1 AM0 ER
Communication Security Mode
0
0
0 Reserved For Future Use (Not Supported)
0
0
1 Dual Access Authentication Mode
0
1
0 Reserved For Future Use (Not Supported)
0
1
1 Authentication for Read / Write
1
0
0 Reserved For Future Use (Not Supported)
1
0
1 Authentication for Write
1
1
0 Encryption for Read / Write
1
1
1 No Authentication or Encryption Required
Auth. Key (AK)
N/A
Read / Write Access
N/A
Read / Write Access
N/A
Read / Write Access
Read / Write Access
N/A
Pgm-Only Key (POK)
N/A
Read / Program Access
N/A
N/A
N/A
N/A
N/A
N/A
WLM:
Write Lock Mode control.
By default the Write Lock Mode is disabled. If WLM = 0b then Write lock Mode is enabled and the User Zone is
effectively divided into 8 byte pages with the first byte of each page controlling write access to all 8 bytes. Figure 23
shows an example of WLM on two contiguous 8 byte pages.
Figure 23. Example of byte level access control using the Write Lock Mode.
Page
$0
$1
$2
$3
$4
$5
$6
11011001 b $xx
$xx
$xx
$00
Locked Locked
$xx
$xx
$xx
Locked
$7
< Address
$xx
< Data
< Status
Page
$8
$9
$A
10101010 b $xx
$xx
$08
Locked Locked
$B
$C
$D
$E
$F
$xx
$xx
$xx
$xx
$xx
Locked
Locked
< Address
< Data
< Status
The first byte of each virtual 8 byte page is called the Write Lock Byte. Each bit of the Write Lock Byte controls the
locked status of one byte in the page. Write access is forbidden to a byte if its associated lock bit is set to 0b. Bit 7
controls byte 7, bit 6 controls byte 6, etc.
Note: When WLM is enabled, Write User Zone commands are restricted to a length of one byte.
MDF:
Modify Forbidden mode control.
By default the Modify Forbidden mode is disabled. If MDF = 0b then Modify Forbidden mode is enabled and no write
access is allowed to the User Zone. The User Zone effectively becomes Read Only Memory (ROM).
PGO:
Program Only mode control.
By default the Program Only mode is disabled. If PGO = 0b then data within the User Zone may be changed from 1b to
0b, but never from 0b to 1b. Note that when PGO is enabled, Write User Zone commands are restricted to a length of
one byte.
95
5276C–RFID–3/09
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