AT88SC1616CRF View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT88SC1616CRF' PDF : 158 Pages View PDF
H.2.
Access Registers (AR) [88RF]
There is one Access Register for each User Zone in the user memory. The default state of this register is $FF, which
disables all of the optional security features.
Figure 24. Definition of the Access Register for User Zone 1 of 88RF PICCs.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PM1 PM0 M2
M1
M0
RFU MDF PGO
1
1
1
1
1
1
1
1
Default Value
Figure 25. Definition of the Access Register for User Zones 0, 2, and 3 of 88RF PICCs.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PM1 PM0 M2
M1
M0
RFU MDF RFU
1
1
1
1
1
1
1
1
Default Value
The Access Register definition is shown in Figure 24 and Figure 25. Bit 2 is Reserved for Future Use. Changes to the
AR registers are effective immediately.
PM:
Password Mode selection bits.
The PM0 and PM1 bits control the password requirements for the User Zone as shown in Table 66. By default, no
password is required for access to the User Zone. If PM = 10b, then write password verification is required for write
access; read access does not require any password. If PM = 01b or 00b, then write password verification is required for
read/write access and read password verification is required for read-only access. The password set assigned to the
zone is specified in the Key Register.
Table 66. Coding of the Password Mode bits of the Access Register.
PM1
PM0
Access
1
1
No Password Required
1
0
Write Password Required
0
1
Read and Write Passwords Required
0
0
M:
Communication Security Mode control.
The Access Register M bits determine the Communication Security mode requirements for the User Zone. By default
M = 111b and no Authentication or Encryption Activation is required to access the user memory.
96 AT88SC0808/1616/3216/6416CRF, AT88RF04C
5276C–RFID–3/09
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