MCRF450 Просмотр технического описания (PDF) - Microchip Technology

Номер в каталоге

Компоненты Описание

производитель

MCRF450

13.56 MHz Read/Write Passive RFID Device

Microchip Technology 

MCRF450/451/452/455

6.2 Anti-collision Command

Controller

This section discusses the anti-collision algorithm and

describes the communications between the

Interrogator and device.

6.2.1

STRUCTURE OF READ/ WRITE

COMMAND SIGNALS

The Interrogator’s Read/Write commands have the

following structure:

Read/Write command = Command + Address + Data + Parity (or CRC)

The commands are summarized in the table below:

TABLE 6-2: READ/WRITE COMMANDS FROM INTERROGATOR TO DEVICE

Interrogator

Command

Command

Code

Address

Data

Parity or CRC

Unused

Read 32-bit block

0xx

xxxxx

—

—

110

aaaaa

—

Parity

Unused

111

00xxx

—

—

Unused

End Process

Unused

Unused

Unused

111

0100x

—

—

111

01010

—

Parity

111

01011

—

—

111

011xx

—

—

111

1000x

—

—

Set Talk First Bit

111

10010

—

Parity

Set FR Bit

111

10011

—

Parity

Clear Talk First Bit

111

10100

—

Parity

Clear FR Bit

111

10101

—

Parity

Unused

111

1011x

—

—

Unused

111

11xxx

—

—

Unused

100

Write 32-bit block

101

Legend: aaaaa = Block address

x = don’t care

xxxxx

aaaaa

—

32 bits

—

CRC-16

Note:

• Command and address are sent MSN (Most

Significant nibble) first.

• Data and parity/CRC are sent LSN (Least

Significant nibble) first.

• Calculation of Parity and CRC includes Command

code, Address, and Data.

• See Microchip Application Note AN752

(DS00752) for the CRC-16 calculation algorithm.

Symbol

Length

—

3 symbols

—

—

3 symbols

—

—

—

3 symbols

3 symbols

3 symbols

3 symbols

—

—

—

14 symbols

DS40232H-page 20

 2003 Microchip Technology Inc.

Share Link: