AS3955 datasheet(73/111 Pages) AMSCO

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ams Datasheet

Page 73

[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

Direct Commands

Figure 81:

List of Direct Commands

Set Default

This direct command puts the AS3955 in the same state as

power-up initialization except for I²C bit in register IC Status

Display Register that defines the interface and IO Configuration

Clear Buffer

Clears buffer, buffer overflow and underflow bits.

Restart Transceiver

Resets protocol logic to its initial state except for the tag state.

This interrupts all receptions and transmissions that are being

processed at the time.

Command Byte

Value <hex>

Command

Comments

Set Default

Set AS3955 to default state

Clear Buffer

Clears buffer and its error flags

Restart Transceiver

Restarts transceiver communication logics

Disable/Enable Transceiver

Toggles disable transceiver bit

Transmit Buffer

Starts a transmit sequence of the buffer content

Transmit ACK

Transmits NFC ACK reply

Transmit NACK 0

Transmits NFC NAK reply with code 0h

Transmit NACK 1

Transmits NFC NAK reply with code 1h

Transmit NACK 4

Transmits NFC NAK reply with code 4h

Transmit NACK 5

Transmits NFC NAK reply with code 5h

Go To Sleep

Puts a tag in SLEEP state

Go To Sense

Puts a tag in SENSE state

Go To Sense / Sleep

Puts a tag in SENSE or SLEEP state depending

on the internal AS3955 state

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