IRCC datasheet(71/79 Pages) SMSC

No. de pieza	IRCC

Descripción Electrónicos	INFRARED COMMUNICATIONS CONTROLLER

PDF	79 Pages

Scroll/Zoom	100%

Fabricante Electrónico	SMSC [SMSC Corporation]

Página de inicio	http://www.smsc.com

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PROGRAMMED I/O

Programmed I/O mode is selected when the

DMA Enable bit in SCE Configuration Register B

is zero.

The IrCC also supports String Move timing which

is a block-mode programmed I/O operation that

utilizes IOCHRDY to control the transfer (Figure

41). String Move mode is selected when the

String Move bit in SCE Configuration Register B

is one.

Polling Interface

Programmed I/O without IOCHRDY requires

polling the FIFO status flags before reading or

writing FIFO data.

The Receiver interface

depends upon the FIFO Not Empty flag. If FIFO

Not Empty is true, there is read data available in

the FIFO (Figure 42). The Transmitter interface

depends upon the FIFO Full flag. If FIFO Full is

false, there is room for write data in the FIFO (

Figure 43).

FIFO Not E m pty

IO CHRDY

IO R

S tring M ov e

AE N

FIGURE 41 - STRING MOVE TIMING

DM A Enable

IOR

String M ove

FIFO Data READ

Status READ

FIFO NOT EM PTY

FIGURE 42 - PROGRAMMED I/O READ TIMING

IRCC Datasheet(PDF) 71 Page - SMSC Corporation