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

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Lista de partido

CIRCC

Consumer Infrared Communications Controller

SMSC -> Microchip 

String Move

DMA Enable

FIFO NOT EMPTY

IOR

FIFO Data READ

Status READ

FIGURE 29 - PROGRAMMED I/O READ TIMING

String Move

DMA Enable

FIFO FULL

IOW

FIFO Data WRITE

Status READ

FIGURE 30 - PROGRAMMED I/O WRITE TIMING

FIFO Interrupt Interface

Transmit

Transmitting messages with Programmed I/O

using FIFO Interrupt requires writing a fixed

number of data bytes, usually related to the

threshold, whenever the FIFO Interrupt

becomes active. An appropriate FIFO

Threshold value allows the host to efficiently satsify

the FIFO service requests until the message

transmission is complete. For slow systems, the

FIFO can be manually filled with transmit data

before the transmitter is enabled. NOTE: The

FIFO will automatically request service before the

transmitter is activated if the FIFO Threshold is

greater than zero.

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