RM310 NXP Semiconductors, RM310 Datasheet - Page 31

• Manufacturer Part Number: RM310
• Description: Ht Rm 310 Hitag Tm Mini Reader Module
• Manufacturer: NXP Semiconductors

HT RM310
3.3.22. WriteSecret_HT
Using this command the reader module receives the data needed for the secret access to the
HITAG transponders. The data is stored "write only" in the internal EEPROM of the Crypto
Processor.
In order to change the data, the value of the current data has to be transmitted first to the reader
module. The individual data areas of the secret access data are changed one after another and the
module returnes “no error“ statusbytes(0x00) for each matching data couple (old and new data).
The personalization process is interrupted if the comparison of old and new data prove inconsis-
tent. The module then returnes the according status for the data couple that does not match.
Please Note : To successfully change the secret data you have to complete the whole proce-
Protocol:
Host - Reader module
Reader module - Host
Host - Reader module
Reader module - Host
Htrm310.doc/HS
dure step by step as shown in the following protocol description.
In case of an error the host has to cancel the personalization procedure.
Page 31 of 41
Rev. 2.3
status: 0 no error
status: 0 no error
0x00
old Key A [0]
old Key A [3]
new Key A [0]
new Key A [3]
status
0x00
old Key B [0]
old Key B [3]
new Key B [0]
new Key B [3]
status
1 INTERFACE error
80 Wrong Crypto
81 Wrong old Key A
1 INTERFACE error
80 Wrong Crypto
82 Wrong old Key B
02-10-1998