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
READ_PAGE_INV
The command READ_PAGE_INV returns the complement
of 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 12. If accepted, the command
Response consists of the complement of the 32 bit content.
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
READ_PAGE_INV
0 1, pg2, pg1, pg0 1 0, pg2, pg1, pg0
CM[4:0]
CM[4:0]
Figure 12. READ_PAGE_INV timing
EQ
11111
Data
bit 31 ..................... bit 0
tWAIT,Tr
tWAIT,Bs
2010 May 04
16
CONFIDENTIAL
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