AT88SC1616CRF View Datasheet(PDF) - Atmel Corporation
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MFG CO.
'AT88SC1616CRF' PDF : 158 Pages View PDF
Appendix H. Configuration of Password and Access Control Registers
There are two types of configuration registers in CryptoRF, User Zone access control registers, and Device
Configuration Registers. The User Zone Access Registers (AR) set the access requirements for a single User Zone.
The Device Configuration Register (DCR) selects optional behaviors for the PICC. Both types of registers are
described in this appendix.
H.1.
User Zone Configuration Options
Access to each User Zone in the CryptoRF user memory is controlled by two registers in the Configuration Memory.
The Access Register controls the access conditions for the User Zone. The Password Register (PR) or Key Register
(KR) controls the password set assigned to the User Zone. The default setting for these registers sets the security
requirement to open access, no security features active, for all User Zones.
Each set of User Zone access control registers has a name matched to the User Zone name. For example for 88SC
PICCs, User Zone 1 is controlled by AR1 and PR1, User Zone 2 is controlled by AR2 and PR2. User Zone i is
controlled by ARi and PRi.
H.1.1. Access Registers (AR) [88SC]
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 22. Definition of the User Zone Access Registers for 88SC PICCs.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PM1 PM0 AM1 AM0
ER
WLM MDF PGO
1
1
1
1
1
1
1
1 Default Value
The Access Register definition for 88SC PICCs is shown in Figure 22. 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 64. 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 Password Register.
Table 64. 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
AM:
Authentication Mode selection bits.
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 J for information on the Authentication Communication Security modes.
ER:
Encryption Mode selection bit.
94 AT88SC0808/1616/3216/6416CRF, AT88RF04C
5276C–RFID–3/09
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