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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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IRCC 데이터시트(PDF) 57 Page - SMSC Corporation |
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IRCC 데이터시트(HTML) 57 Page - SMSC Corporation |
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57 / 79 page  57 Transmit Timing The SCE IrDA-mode transmitter is enabled by setting the appropriate SCE MODES bits in SCE Line Control Register B. If the FIFO Threshold is zero, message transmission begins as soon as transmit mode has been enabled and there is data in the FIFO (Figure 22). If the FIFO Threshold is greater than zero, message transmission begins only after transmit mode has been enabled and the FIFO Threshold has been exceeded or TC is active (Figure 23). NOTE: the IrDA-mode SCE transmitter will only be enabled when the SIR Interaction Pulse generator is inactive. Once an IrDA transmission has begun, the End of Message (EOM) and other state indicators are cleared and the nActive Frame signal is enabled. Following the frame check sequence, EOM is reactivated and an EOM interrupt is generated. Following the end of the frame, nActive Frame is disabled (Figure 24). FIFO E m pty Tx E n a b le T r an sm it A c tive SIP T im e FIGURE 22 - IrDA FIR TRANSMIT ENABLE TIMING: FIFO THRESHOLD = 0 FIFO T h r e s h old Tx E n a b le T r an sm it TC Ac tiv e S IP T im e FIGURE 23 - IrDA FIR TRANSMIT TIMING: FIFO THRESHOLD > 0 |
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