CLRC63201TSLASH0FE datasheet(115/163 Pages) PHILIPS

115 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

115

Confidential

18.4 Commands for ISO14443 A Card Communication

The CL RC632 is a fully ISO 14443 and ISO15693 and I

•CODE1 compliant reader IC. Therefore, the

command set of this IC allows more flexibility and more generalised commands compared to MIFARE or

•CODE1 dedicated reader ICs. The following chapter describes the command set for card communication

for ISO14443 A related communication schemes.

18.4.1 TRANSMIT COMMAND 1AHEX

Command

Codehex

Action

Arguments and Data

Returned Data

Transmit

Transmits data from FIFO buffer to the card

Data Stream

The Transmit-Command takes data from the FIFO buffer and forwards it to the transmitter. It does not return

any data. The Transmit-Command can only be started by the µ-Processor.

18.4.1.1 Working with the Transmit Command

To transmit data one of the following sequences may be used:

1. All data, that shall be transmitted to the card is written to the FIFO while the Idle-Command is active.

After that, the command code for the Transmit-Command is written to the Command-Register.

Note: This is possible for transmission of data with a length of up to 64 bytes.

2. The command code for the Transmit-Command is written to the Command-Register first. Since no data

is available in the FIFO, the command is only enabled but transmission is not triggered yet.

Data transmission really starts with the first data byte written to the FIFO. To generate a continuous data

stream on the RF-interface, the µ-Processor has to put the next data bytes to the FIFO in time.

Note: This allows transmission of data of any length but requires that data is available in the FIFO in

time.

3. A part of the data, that shall be transmitted to the card is written to the FIFO while the Idle-Command is

active. After that, the command code for the Transmit-Command is written to the Command-Register.

While the Transmit-Command is active, the µ-Processor may feed further data to the FIFO, causing the

transmitter to append it to the transmitted data stream.

Note: This enables transmission of data of any length but requires that data is available in the FIFO in

time.

When the transmitter requests the next data byte to keep the data stream on the RF-interface continuous but

the FIFO buffer is empty, the Transmit-Command automatically terminates. This causes the internal state

machine to change its state from Transmit to Idle.

If data transmission to the card is finished, the CL RC632 sets the flag TxIRq to signal it to the µ-Processor.

Remark: If the µ-Processor overwrites the transmit code in the Command-Register with the Idle-Command or

any other command, transmission stops immediately with the next clock cycle. This may produce output

signals that are not according to ISO14443-A.

18.4.1.2 RF-Channel Redundancy and Framing

Each transmitted ISO14443 frame consists of a SOF (start of frame) pattern, followed by the data stream

and is closed by an EOF (end of frame) pattern. These different phases of the transmit sequence may be

monitored by watching ModemState of PrimaryStatus-Register (see 18.4.4).

CLRC63201T/0FE Datasheet(PDF) 115 Page - NXP Semiconductors

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