IRCC SMSC Corporation, IRCC Datasheet - Page 12

• Manufacturer Part Number: IRCC
• Description: INFRARED COMMUNICATIONS CONTROLLER
• Manufacturer: SMSC Corporation

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.
T ransm itter
R eceiv er
Tx Polarity bit = 1
R x Polarity bit = 0
FIGURE 5 - TV REMOTE ASK ENCODE/DECODE
Table 11 - Receive Carrier Sense Range
T V T x Output
SC E T x Data
SC E R x Data
T V R x Input
D1
0
0
1
1
D0
0
1
0
1
12
1
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.
reserved
RANGE
±10%
±20%
±40%
1/Bit R ate
1/C arrier
0
Light
N o Light
N o Light
Light
1