SLRC400 datasheet(97/130 Pages) PHILIPS

97 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

Preliminary

16.3.1 BASIC STATES

16.3.2 STARTUP COMMAND 3FHEX

Command

Codehex

Action

Arguments and Data

Returned Data

StartUp

Runs the Reset- and Initialisation Phase

Note: This command can not be activated by

software, but only by a Power-On or Hard

Reset

The StartUp-Command runs the Reset- and Initialisation Phase. It does not need or return any data. It can

not be activated by the µ-Processor but is started automatically after one of the following events:

•

Power On Reset caused by power up at Pin DVDD

•

Power On Reset caused by power up at Pin AVDD

•

Negative Edge at Pin RSTPD

The Reset-Phase defines certain register bits by an asynchronous reset. The Initialisation-Phase defines

certain registers with values taken from the E²PROM.

When the StartUp-Command has finished, the Idle-Command is entered automatically.

Notes:

•

The µ-Processor must not write to the SL RC400 as long as the SL RC400 is busy executing the

StartUp-Command. To ensure this, the µ-Processor shall poll for the Idle-Command to determine the

end of the Initialisation Phase (see also chapter 11.4).

•

As long as the StartUp-Command is active, only reading from page 0 of the SL RC400 is possible.

•

The StartUp-Command can not be interrupted by the µ-Processor.

16.3.3 IDLE COMMAND 00HEX

Command

Codehex

Action

Arguments and Data

Returned Data

Idle

No action: cancels current command execution

The Idle-Command switches the SL RC400 to its inactive state. In this Idle-state it waits for the next

command. It does not need or return any data. The device automatically enters the Idle-state when a

command finishes. In this case the SL RC400 simultaneously initiates an interrupt request by setting bit

IdleIRq. Triggered by the µ-Processor, the Idle-Command may be used to stop execution of all other

commands (except the StartUp Command). In that case no IdleIRq is generated.

Remark: Stopping a command with the Idle Command does not clear the FIFO buffer content.

SLRC400 Datasheet(PDF) 97 Page - NXP Semiconductors

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