ATA555812-DDW Atmel, ATA555812-DDW Datasheet - Page 29

• Manufacturer Part Number: ATA555812-DDW
• Manufacturer: Atmel

Specifications of ATA555812-DDW

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Not Compliant

7.5
7.6
4681C–RFID–09/05
LoginRead
LoginWrite
Table 7-8.
The purpose of the LoginRead command is to release the read protection on all read protected
data blocks within the user memory. A tag in the Selected state will respond with a SOF pattern
if the transmitted read password matches the data stored in the tag’s system memory block
36hex (Read PWD). In the case of a non-matching read password the tag will reply with a SOF
pattern followed by an error code. After a successful LoginRead command, all read protected
memory blocks may be read normally. This positive login status remains valid until a new tag is
selected or the tag is reset.
Table 7-9.
Table 7-10.
The purpose of the LoginWrite command is to release the write protection on all write protected
data blocks within the user memory. A tag in the Selected state responds with a SOF pattern if
the transmitted write password matches the data stored in the tag’s system memory block 37hex
(Write PWD). In the case of a non-matching write password the tag will reply with an SOF fol-
lowed by an error code. After a successful LoginWrite command any write protected memory
block may be modified, as long as the addressed memory block is not already locked. The posi-
tive login status is valid until a new tag is selected or the tag is reset.
Table 7-11.
Table 7-12.
SOF
Start of Frame
3 .. 10-bit period
Command
LoginRead = 00 01
4 bits
SOF
Start of Frame
3 .. 10-bit period
Command
LoginWrite = 00 01
4 bits
SOF
Start of Frame
3 .. 10-bit period
Tag Response
Interrogator Command Parameters
Tag Response
Interrogator Command Parameters
Tag Response
Parameter 1
11 01 10 (36hex)
6 bits (MSB first)
Parameter 1
11 01 11 (37hex)
6 bits (MSB first)
Error Flags
Present on error only
4-bit – dual pattern code
Error Flags
Present on error only
4-bit – dual pattern code
Error Flags
Present on error only
4-bit – dual pattern code
ATA5558 [Preliminary]
Parameter 2
10
2 bits
Parameter 2
10
2 bits
Parameter 3
Write Password
32 bits (MSB first)
Parameter 3
Read Password
32 bit (MSB first)
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