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IRCC Datasheet(PDF) 10 Page - SMSC Corporation

Part # IRCC
Description  INFRARED COMMUNICATIONS CONTROLLER
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

IRCC Datasheet(HTML) 10 Page - SMSC Corporation

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10
DESCRIPTION
Carrier Frequency Divider
The Carrier Frequency Divider register is used to
program the ASK carrier frequency for the
transmit modulator and receive detector (Figure
5). The divider is eight bits wide.
The input clock to the Carrier Frequency Divider
is 1.6MHz (48MHz
÷ 30).
The relationship
between the divider value (CFD) and the carrier
frequency (Fc) is as follows:
CFD = (1.6MHz/Fc) - 1
For example, program the Carrier Frequency
Divider register with 41 ('29'Hex) for a 38KHz TV
Remote:
Fc = 38.095KHz.
This is ~.25%
accuracy. Table 9 contains representative CFD
vs. Carrier Frequency relationships.
The Carrier Frequency range is 1.6MHz to
6.25KHz.
The carrier frequency encoder/decoder can be
defeated using the Carrier Off bit. When Carrier
Off is one, the transmitter outputs a non-
modulated SCE serial NRZ data stream at the
programmed bit rate; the receiver does not
attempt to demodulate a carrier from the
incoming serial data stream.
Table 9 - Representative Carrier Frequencies
CFD
Fc (KHz)
CFD
Fc (KHz)
CFD
Fc (KHz)
CFD
Fc (KHz)
001
800.000
065
24.242
129
12.308
193
8.247
005
266.667
069
22.857
133
11.940
197
8.081
009
160.000
073
21.622
137
11.594
201
7.921
013
114.286
077
20.513
141
11.268
205
7.767
017
88.889
081
19.512
145
10.959
209
7.619
021
72.727
085
18.605
149
10.667
213
7.477
025
61.538
089
17.778
153
10.390
217
7.339
029
53.333
093
17.021
157
10.127
221
7.207
033
47.059
097
16.327
161
9.877
225
7.080
037
42.105
101
15.686
165
9.639
229
6.957
041
38.095
105
15.094
169
9.412
233
6.838
045
34.783
109
14.545
173
9.195
237
6.723
049
32.000
113
14.035
177
8.989
241
6.612
053
29.630
117
13.559
181
8.791
245
6.504
057
27.586
121
13.115
185
8.602
249
6.400
061
25.806
125
12.698
189
8.421
253
6.299



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