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CIRCC

Consumer Infrared Communications Controller

SMSC -> Microchip 

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 10.

Carriers that fall outside of the programmed

range set the Frame Abort bit. If the “Carrier Off”

bit is active, the Receive Carrier range sensitivity

function is disabled.

Table 10 - Receive Carrier Sense Range

D1

D0

RANGE

0

0

±10%

0

1

±20%

1

0

±40%

1

1

Reserved

1

SCE Tx Data

Transmitter

TV Tx Output

Tx Polarity bit = 1 (default)

0

1

1/Carrier

Light

No Light

TV Rx Input

Receiver

SCE Rx Data

Driver

Rx Polarity bit = 0 (default)

No Light

Light

1/Bit Rate

FIGURE 6 - REMOTE CONTROL ASK ENCODE/DECODE

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