SLRC400 Datasheet, PDF (95/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
16 SL RC400 COMMAND SET
16.1 General Description
The SL RC400 behaviour is determined by an internal state machine that is capable to perform a certain set
of commands. These commands are started by writing the according command-code to the Command-
Register.
Arguments and/or data necessary to process a command are exchanged via the FIFO buffer.
16.2 General Behaviour
• Each command, that needs a data stream (or data byte stream) as input will immediately process the
data it finds in the FIFO buffer.
• Each command, that needs a certain number of arguments will start processing only when it has
received the correct number of arguments via the FIFO buffer.
• The FIFO buffer is not cleared automatically at command start. Therefore, it is also possible to write the
command arguments and/or the data bytes into the FIFO buffer and start the command afterwards.
• Each command (except the StartUp-Command) may be interrupted by the µ-Processor by writing a new
command code into the Command-Register e.g.: the Idle-Command.
95
Preliminary