CIRCC Ver la hoja de datos (PDF) - SMSC -> Microchip

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CIRCC

Consumer Infrared Communications Controller

SMSC -> Microchip 

DMA Burst

DMA Enable

Rx Enable

DRQ

Refresh Interval

FIFO NOT EMPTY

TC

FIGURE 27 - DMA BURST MODE RECEIVE TIMING

PROGRAMMED I/O

Programmed I/O mode is selected when the

DMA Enable bit in SCE Configuration Register B

is zero. The CIrCC also supports String Move

timing which is a block-mode programmed I/O

operation that utilizes IOCHRDY to control the

transfer (Figure 28). String Move mode is

selected when the String Move bit in SCE

Configuration Register B is one.

AEN

String Move

FIFO Not Empty

IOCHRDY

IOR

FIGURE 28 - STRING MOVE TIMING

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 29). The Transmitter interface

depends upon the FIFO Full flag. If FIFO Full is

false, there is room for write data in the FIFO

(Figure 30).

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