PCF7936AS/3851/C,1-CT NXP Semiconductors, PCF7936AS/3851/C,1-CT Datasheet - Page 12

• Manufacturer Part Number: PCF7936AS/3851/C,1-CT
• Description: pcf7936as series 32-bit 125 khz read / write security...
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Security Transponder (HITAG2)
7.2.2 AUTHORIZED State
The AUTHORIZED state is entered only after successful
device authentication, see START_AUTH command. In
AUTHORIZED state the Transponder Memory, TM, can be
accessed by means of subsequent read and write
commands, see Table 3.
Communication with the device employs plain (Password
Mode) respectively ciphered (Cipher Mode) transmission of
commands and data.
The Transponder Memory is accessed page wise in
accordance with the memory protection configuration.
Table 3. Command Set in AUTHORIZED State
READ_PAGE
READ_PAGE_INV
WRITE_PAGE
HALT
Note
1. Any coding of the bits CM[2:0] will force HALT state,
Any read respectively write attempt to a page that is read
respectively write protected by the corresponding bit in the
configuration page, would cause the device to terminate the
AUTHORIZED state and to enter WAIT state.
2010 May 04
however, for future compatibility the values in brackets
should be applied.
1)
NAME
CM4 CM3 CM2 CM1 CM0
1
0
1
0
COMMAND, CMD
1
1
0
0
X (0) X (0) X (1)
pg2
pg2
pg2
pg1
pg1
pg1
pg0
pg0
pg0
12
7.2.3 HALT State
The HALT state may be entered from AUTHORIZED state
only. In HALT state the device is muted and any further
commands are ignored.
To exit the HALT state a transponder LF Field Power-On
Reset condition must be generated, by means of muting
the LF field for the specified time.
7.2.4 READ ONLY State
The READ ONLY state is entered without command
interrogation, after termination of the time-out, t
also section 7.7.
In READ ONLY mode command decoding is disabled and
the device repeatedly transmits user data, according to the
selected Read Only mode, see section 7.5.
The READ ONLY state may be terminated as a result of a
transponder LF Field Power-On Reset condition only, by
means of muting the LF field for the specified time.
Product Specification
PCF7936AS
CONFIDENTIAL
WAIT,SA
, see