MCRF450 데이터 시트보기 (PDF) - Microchip Technology

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MCRF450

13.56 MHz Read/Write Passive RFID Device

Microchip Technology 

MCRF450/451/452/455

FIGURE 6-1:

ANTI-COLLISION FLOW CHART

DETECTION

Power-up

in Tuned State

TC=0

Set Processing Flag

FR Bit Yes

Set

?

No

REACTIVATION

No

No 1

Talk-First No

Bit Set?

FRR

No

Command?

PPM

Yes

Symbol?

TC > 0?

Yes

Yes

Clear Position 1 Flag

Decode FRR Command

Yes

Set Position 1 Flag

Listen for FRB Command

Wait 1, 16, or 64 Time Slot

No

FRB

Received?

Yes

Send FRB Response

(Tag ID: Block 1 Data)

Yes

Listening

Window Expired?

No

Receiving?

No

Yes

No

3 PPM

Symbols?

Yes

No 3rd Symbol

=MC2?

Yes

No Correct Matching

Code?

Yes

Send FRR Response

(Tag ID + FRF data)

Listening

Window

Yes

Expired?

No

No

Receiving?

Yes

3 PPM

No

Symbols?

Yes

3rd Symbol

No

=MC1?

No

TCMAX

ELAPSED

Yes

?

Increment

Transmission

Counter (TC)

No

Position 1

Yes

Flag Set?

No

3rd Symbol

=MC2?

PROCESSING

Execute

Command

Yes

No Processing

Flag Set?

Wait for Commands

Decode Command

at Correct Speed

Yes

Correct

No

Matching

Code?

Yes

No

Valid

Command?

Yes

Yes Read or Write

Command?

No

No

End

Yes

Command?

No

Processing Yes

Flag Set?

Yes

Clear Processing Flag

Correct

Matching

No

Code?

Yes

Set Processing Flag

Maintain

Logic State

(Do not listen to

any command)

SLEEPING

 2003 Microchip Technology Inc.

DS40232H-page 19

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