at88rf020 ATMEL Corporation, at88rf020 Datasheet - Page 6

• Manufacturer Part Number: at88rf020
• Description: 13.56 Mhz, 2048-bit Rfid Eeprom
• Manufacturer: ATMEL Corporation

Figure 2. AT88RF020 Anticollision and State Transition Flow Chart
6
AT88RF020
Wait for WUPB
with AFI match
Send Answer
HLTB
to HLTB
HALT
State
Wait for ATTRIB or HLTB
with PUPI match
Wait for REQB
AFI Match ?
Send ATQB
Power On
Response
or WUPB
Is N = 1?
Reset
DESELECT
YES
YES
Send Answer
Receive CID
Assignment
to ATTRIB
ACTIVE
NO
NO
State
Matched
Marker
Slot
ATTRIB
YES
REQB or WUPB
Slot Marker = "R"
Select Random
Number "R" in
Range 1 to "N"
Is R = 1?
Wait for
The AT88RF020 processes the following commands when in the
ACTIVE state and only when the CID embedded in the command
matches the CID assigned to the IC :
READ
WRITE
LOCK
CHECK PASSWORD
COUNT
DESELECT
All other commands are ignored when the IC is in the ACTIVE state.
NO
REQB or WUPB
2010C–RFID–2/06