TRF7963ARHBR Datasheet, PDF(25/63 Page) Texas Instruments – FULLY INTEGRATED 13.56-MHz RFID EADER/WRITER FOR ISO14443A,B/NFC STANDARDS

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TRF7963ARHBR Datasheet, PDF (25/63 Pages) Texas Instruments – FULLY INTEGRATED 13.56-MHz RFID EADER/WRITER FOR ISO14443A,B/NFC STANDARDS

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TRF7963A

www.ti.com

SLOS758C â DECEMBER 2011 â REVISED JANUARY 2013

Table 5-7. Address/Command Word Bit Distribution

Bit

Description

Bit Function

Address Command

Command control bit

0 = address

1 = command

Read/Write

1 = read

0 = write

R/W

Continuous address mode

1 = continuous mode

R/W

Address/command bit 4

Adr 4

Cmd 4

Address/command bit 3

Adr 3

Cmd 3

Address/command bit 2

Adr 2

Cmd 2

Address/command bit 1

Adr 1

Cmd 1

Address/command bit 0

Adr 0

Cmd 0

The MSB (bit 7) determines if the word is to be used as a command or as an address. The last two

columns of Table 5-7 show the function of the separate bits if either address or command is written. Data

is expected once the address word is sent. In continuous address mode (continuous mode = 1), the first

data that follows the address is written (or read) to (from) the given address. For each additional data, the

address is incremented by one. Continuous mode can be used to write to a block of control registers in a

single stream without changing the address; for example, setup of the predefined standard control

registers from the MCU non-volatile memory to the reader. In non-continuous address mode (simple

addressed mode), only one data word is expected after the address.

Address Mode is used to write or read the configuration registers or the FIFO. When writing more than 12

bytes to the FIFO, the Continuous Address Mode should be set to 1.

The Command Mode is used to enter a command resulting in reader action (for example, initialize

transmission, enable reader, and turn reader on/off).

Examples of expected communications between an MCU and the TRF7963A are shown.

Table 5-8. Continuous Address Mode

Start

Adr x

Data(x) Data(x+1) Data(x+2) Data(x+3) Data(x+4)

...

Data(x+n) StopCont

Figure 5-5. Continuous Address Register Write Example Starting With Register 0x00 (Using SPI With SS

Mode)

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