PCF7936AS datasheet(12/32 Pages) PHILIPS

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NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

CONFIDENTIAL

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

NAME

COMMAND, CMD

CM4

CM3

CM2

CM1

CM0

READ_PAGE

pg2

pg1

pg0

READ_PAGE_INV

pg2

pg1

pg0

WRITE_PAGE

pg2

pg1

pg0

HALT

X (0)

X (1)

Note

1. Any coding of the bits CM[2:0] will force HALT state,

however, for future compatibility the values in brackets

should be applied.

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.

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, tWAIT,SA, see

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.

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