PCF7936AS View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF7936AS' PDF : 33 Pages View PDF
NXP Semiconductors
Security Transponder (HITAG2)
Product Specification
PCF7936AS
HALT
The command HALT may be issued in AUTHORIZED state
and forces the device to enter the HALT state. For data
integrity reasons the 5 bit command and its complement
have to be send, before the device will accept it, see
Figure 10. If accepted, the command Response consist of
the command itself and its complement.
The 10 bit command sequence may be repeated several
times, if desired, to increase the data integrity level. In the
case that one of the 5 bit commands and its complement
do not match, an error condition occurs that causes the
device to terminate the command, to initialize the device
and to enter the WAIT state. No command Response will
be send by the device in this case.
If the device is configured for Password mode (ENC = 0)
the command sequence is transmitted in plain, while in
Cipher mode (ENC = 1) the whole command sequence is
transmitted ciphered.
READ_PAGE
The command READ_PAGE returns the content of the
designated page. The page designated for reading is
specified by the command bits pg2 to pg0. For data
integrity reasons the 5 bit command and its complement
have to be send, before the device will accept it, see
Figure 11. If accepted, the command Response consists of
the 32 bit content of the designated page. The MSB is send
first.
The 10 bit command sequence may be repeated several
times, if desired, to increase the data integrity level. In the
case that one of the 5 bit commands and its complement
do not match, an error condition occurs that causes the
device to terminate the command, to initialize the device
and to enter the WAIT state. No command Response will
be send by the device in this case.
Subsequent commands may be issued after termination of
tWAIT,Bs.
Any attempt to read a page that is protected against
reading, will be detected and cause an error condition,
upon which the device terminates the command during
tWAIT,Tr and enters the WAIT state. No Response will be
send in this case.
If the device is configured for Password mode (ENC = 0)
the command sequence is transmitted in plain, while in
Cipher mode (ENC = 1) the whole command sequence is
transmitted ciphered.
SEND to
Transponder
RECEIVED from
Transponder
HALT
00001
CM[4:0]
11110
CM[4:0]
Figure 10. HALT timing
EQ
11111
CM[4:0]
00001
CM[4:0]
11110
tWAIT,Tr
SEND to
Transponder
RECEIVED from
Transponder
READ_PAGE
1 1, pg2, pg1, pg0 0 0, pg2, pg1, pg0
CM[4:0]
CM[4:0]
Figure 11. READ_PAGE timing
EQ
11111
Data
bit 31 ..................... bit 0
tWAIT,Tr
tWAIT,Bs
2010 May 04
15
CONFIDENTIAL
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