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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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IRCC 데이터시트(PDF) 71 Page - SMSC Corporation |
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IRCC 데이터시트(HTML) 71 Page - SMSC Corporation |
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71 / 79 page  71 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 |
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