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IRCC Datasheet(PDF) 20 Page - SMSC Corporation |
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IRCC Datasheet(HTML) 20 Page - SMSC Corporation |
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20 / 79 page  20 The SIR Interaction Pulse is controlled by the IrCC configuration register SIP ENABLE bit and a timer. The IrCC transmits an SIR Interaction Pulse every 500ms when the SIP enable is active, an IrDA FIR mode has been selected, and the transmitter or receiver is not otherwise engaged. The timer that controls the SIP pulse is reset whenever 1) the SIP enable is inactive, 2) an active FIR frame is being transmitted or received or, 3) during an active SIP pulse. The timer is decrementing whenever the SIP enable bit is active and the SIP pulse generator, the transmitter, and the receiver are inactive. When the timer reaches zero, the SIP pulse generator is activated (Figure 13). 1.6us 8.7us SIP ActiveSIP Time FIGURE 12 - SIR INTERACTION PULSE Active Frame SIP Enable Reset SIP Timer SIP Timer Countdown Active SIP Time SIP Timer Zero FIGURE 13 - SIP CONTROL TIMING |
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