CIRCC Ver la hoja de datos (PDF) - SMSC -> Microchip
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CIRCC Datasheet PDF : 70 Pages
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Bit Rate Divider
The Transmit and Receive Bit Rate Divider
register is used to extract a serial NRZ data
stream for the CIrCC SCE. The divider is eight
bits wide.
The input clock to the Bit Rate Divider is 100kHz
(Carrier Frequency Divider input clock ÷ 16).
The relationship between the Bit Rate Divider
(BRD) and the Bit Rate (Fb) is as follows:
BRD = (.1MHz/Fb) - 1
For example, program the Bit Rate Divider with
55 ('37'Hex) for a .562ms Remote Control bit cell
like for the NEC remote control frame format: Fb
= 1.786kHz. This is ~.5% accuracy. Table 9
contains representative BRD vs. Bit Rate
relationships. The Bit Rate range is 100kHz to
390.625Hz.
It is important to note that the bit rate as
determined by the SCE CIR Bit Rate Divider
register is not necessarily the data signaling rate
for any given consumer remote control
modulation scheme. For example, to support the
NEC PPM remote control message frame format
in the CIrCC, the value programmed in the SCE
CIR Bit Rate register must be one half of the
signaling rate for an NEC PPM “0” (see Figure
5).
Table 9 - Representative Bit Rates
BRD Fb (kHz)
003 25.000
007 12.500
011 8.333
015 6.250
019 5.000
023 4.167
027 3.571
031 3.125
035 2.778
039 2.500
043 2.273
047 2.083
051 1.923
055 1.786
059 1.667
063 1.563
BRD Fb (kHz)
067 1.471
071 1.389
075 1.316
079 1.250
083 1.190
087 1.136
091 1.087
095 1.042
099 1.000
103 0.962
107 0.926
111 0.893
115 0.862
119 0.833
123 0.806
127 0.781
BRD
131
135
139
143
147
151
155
159
163
167
171
175
179
183
187
191
Fb (kHz) BRD
0.758 195
0.735 199
0.714 203
0.694 207
0.676 211
0.658 215
0.641 219
0.625 223
0.610 227
0.595 231
0.581 235
0.568 239
0.556 243
0.543 247
0.532 251
0.521 255
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
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