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IRCC Datasheet(PDF) 12 Page - SMSC Corporation |
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IRCC Datasheet(HTML) 12 Page - SMSC Corporation |
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12 / 79 page  12 Receive Carrier Sense The Programmable Receive Carrier Sense register is used to program the Consumer IR decoder to detect the presence of IR energy in a wide-to-narrow range of carrier frequencies. The register is two bits wide. The range values are shown in Table 11. Carriers that fall outside of the Receive Carrier range sensitivity “abort” the message; i.e., the Abort bit is set, an EOM Interrupt is generated, and the receiver is disabled. If the “Carrier Off” bit is active, the Receive Carrier range sensitivity is disabled. Table 11 - Receive Carrier Sense Range D1 D0 RANGE 0 0 ±10% 0 1 ±20% 1 0 ±40% 1 1 reserved 10 1 SCE T x Data T V Tx Output T ransmitter TV Rx Input SCE Rx Data Receiver 1/Carrier 1/Bit Rate No Light Light Light No Light Tx Polarity bit = 1 Rx Polarity bit = 0 FIGURE 5 - TV REMOTE ASK ENCODE/DECODE |
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