NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

13

CONFIDENTIAL

7.3 Command Set

Device operation is controlled by commands issued from

the basestation. Table 4 gives a comprehensive summary

of the applicable commands in alphabetic order. Command

operation and acceptance depend on the actual device

state in which the command is being issued as well as on

the device configuration (Password/Cipher Mode), see also

section 7.2. A command being issued in a different state

may cause an error condition.

Table 4. Command Set Summary

NAME

DESCRIPTION

APPLICABLE

DEVICE STATE

HALT

Forces the device to enter the HALT state

AUTHORIZED

READ_PAGE

Reads 32 bit from the designated memory page, if not restricted by the

corresponding memory protection flags or by specification

AUTHORIZED

READ_PAGE_INV

Reads 32 bit from the designated memory page, if not restricted by the

corresponding memory protection flags or by specification. The content of the page

is returned in inverse polarity.

AUTHORIZED

START_AUTH

Starts the device authentication sequence

WAIT

WRITE_PAGE

Writes 32 bit to the designated memory page, if not restricted by the corresponding

memory protection flags or by specification

AUTHORIZED