SLRC400 datasheet(107/130 Pages) PHILIPS

107 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

107

Preliminary

16.6

Diverse Commands

16.6.1 LOADCONFIG COMMAND 07HEX

16.6.1.1 Overview

Command

Codehex

Action

Arguments and Data

Returned Data

LoadConfig

Reads data from E²PROM and initialises the

registers

Start Address LSB

Start Address MSB

The LoadConfig-Command interprets the first two bytes found in the FIFO buffer as E²PROM starting

byte-address. When the two argument-bytes are available in the FIFO buffer, 32 bytes from the E²PROM are

copied into the SL RC400 control and configuration registers, starting at the given E²PROM starting

byte-address. The LoadConfig-Command can only be started by the µ-Processor. It stops automatically

when all relevant registers have been copied.

Note: It is strictly recommended to use only the described E²PROM address area.

16.6.1.2 Register Assignment

The 32 bytes of E²PROM content, beginning with the E²PROM starting byte-address, is written to the

SL RC400 register 10hex up to register 2Fhex (for the E²PROM memory organisation see 6).

Note: The procedure for the register assignment is the same as it is for the Start Up Initialisation (see 11.3).

The difference is, that the E²PROM starting byte-address for the Start Up Initialisation is fixed to 10hex

(Block 1, Byte 0). With the LoadConfig-Command it can be chosen.

16.6.1.3 Relevant Error Flags for the LoadConfig-Command

Valid E²PROM starting byte-addresses are in the range from 10hex up to 60hex.

16.6.2 CALCCRC COMMAND 12HEX

16.6.2.1 Overview

Command

Codehex

Action

Arguments and Data

Returned Data

CalcCRC

Activates the CRC-Coprocessor

Data Byte-Stream

The CalcCRC-Command takes all data from the FIFO buffer as input bytes for the CRC-Coprocessor. All

data stored in the FIFO buffer before the command is started will be processed. This command does not

return any data via the FIFO buffer, but the content of the CRC-register can be read back via the

CRCResultLSB-register and the CRCResultMSB-register. The CalcCRC-Command can only be started by

the µ-Processor. It does not stop automatically but has to be stopped explicitly by the µ-Processor with the

Idle-Command. If the FIFO buffer is empty, the CalcCRC-Command waits for further input from the FIFO

buffer.

Note: Do not use this command to calculate the Quit value for I?CODE1 tag’s because this would terminate

the Transceive command.

SLRC400 Datasheet(PDF) 107 Page - NXP Semiconductors

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