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IRCC Datasheet(PDF) 59 Page - SMSC Corporation |
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IRCC Datasheet(HTML) 59 Page - SMSC Corporation |
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59 / 79 page  59 Receive Timing Once enabled using the SCE Modes bits in Line Control Register B, the IrDA-mode receiver begins searching for valid FIR frames. The affects of non-valid IrDA infrared activity such as out of spec pulse widths and invalid BOF sequences are always reflected in the status indicators in the IrCC registers. When a valid BOF is detected, the EOM from the previous message is disabled, errors are reset, and an nActive Frame Interrupt is sent (Figure 26). EOM and the EOM Interrupt are enabled following an active FCS. Framing errors or a FIFO overrun that occurs before the Frame Check Sequence is complete is indicated in the appropriate status register bits and the message is aborted (Figure 27). EOF FCS I C A BOF FIFO Empty EOM Interrupt Rx Enable Active Frame Active Frame Int. EOM FIGURE 26 - IrDA RX MESSAGE TIMING I C A BOF FIFO Full EOM Interrupt Rx Enable Active Frame EOM Active Frame Int. Overrun Error Abort Error FIGURE 27 - IrDA FIR RX ABORT ON OVERRUN TIMING |
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