CLRC63201TSLASH0FE datasheet(81/163 Pages) PHILIPS

81 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

Confidential

7.3

Controlling the FIFO-Buffer

Besides writing to and reading from the FIFO-buffer, the FIFO-buffer pointers might be reset by setting the bit

FlushFIFO. Consequently, FIFOLength becomes zero, FIFOOvfl is cleared, the actually stored bytes are not

accessible anymore and the FIFO-buffer can be filled with another 64 bytes again.

7.4

Status Information about the FIFO-Buffer

The µ-Processor may obtain the following data about the FIFO-buffers status:

•

Number of bytes already stored in the FIFO-buffer: FIFOLength

•

Warning, that the FIFO-buffer is quite full: HiAlert

•

Warning, that the FIFO-buffer is quite empty: LoAlert

•

Indication, that bytes were written to the FIFO-buffer although it was already full: FIFOOvfl

FIFOOvfl can be cleared only by setting bit FlushFIFO.

The CL RC632 can generate an interrupt signal

•

If LoAlertIRq is set to 1 it will activate Pin IRQ when LoAlert changes to 1.

•

If HiAlertIRq is set to 1 it will activate Pin IRQ when HiAlert changes to 1.

The flag HiAlert is set to 1 if only WaterLevel bytes or less can be stored in the FIFO-buffer. It is generated

by the following equation:

WaterLevel

FIFOLength

HiAlert

≤

−

)

(

The flag LoAlert is set to 1 if WaterLevel bytes or less are actually stored in the FIFO-buffer. It is generated

by the following equation:

WaterLevel

FIFOLength

LoAlert

≤

CLRC63201T/0FE Datasheet(PDF) 81 Page - NXP Semiconductors

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