IRCC2.0 SMSC Corporation, IRCC2.0 Datasheet - Page 12

• Manufacturer Part Number: IRCC2.0
• Description: Infrared Communications Controller
• Manufacturer: SMSC Corporation

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.
BRD
003
007
011
015
019
023
027
031
035
039
043
047
051
055
059
063
Fb (kHz)
25.000
12.500
8.333
6.250
5.000
4.167
3.571
3.125
2.778
2.500
2.273
2.083
1.923
1.786
1.667
1.563
Table 11 - Receive Carrier Sense Range
BRD
067
071
075
079
083
087
091
095
099
103
107
111
115
119
123
127
Table 10 - Representative Bit Rates
D1
0
0
1
1
Fb (kHz)
1.471
1.389
1.316
1.250
1.190
1.136
1.087
1.042
1.000
0.962
0.926
0.893
0.862
0.833
0.806
0.781
D0
0
1
0
1
12
BRD
131
135
139
143
147
151
155
159
163
167
171
175
179
183
187
191
The range values are shown in Table 11.
Carriers that fall outside of the programmed
range “abort” the message; i.e., the Abort bit is
set, an EOM Interrupt is generated, and the
receiver is disabled.
active, the Receive Carrier range sensitivity
function is disabled.
Reserved
RANGE
±10%
±20%
±40%
Fb (kHz)
0.758
0.735
0.714
0.694
0.676
0.658
0.641
0.625
0.610
0.595
0.581
0.568
0.556
0.543
0.532
0.521
BRD
195
199
203
207
211
215
219
223
227
231
235
239
243
247
251
255
If the “Carrier Off” bit is
Fb (kHz)
0.510
0.500
0.490
0.481
0.472
0.463
0.455
0.446
0.439
0.431
0.424
0.417
0.410
0.403
0.397
0.391