PC87307 Datasheet, PDF (162/218 Pages) National Semiconductor (TI) – PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O

UART1 and UART2 (with IR) (Logical Devices 5 and 6)
TABLE 7-26. Consumer IR, High Speed Demodulator (RXHSC = 1) (Frequency Ranges in kHz)
DFR Bits
4 3 2 1 0 _min/max
min
00011
max
min
01000
max
min
01011
max
001
380.95
421.05
436.36
480.00
457.71
502.26
DBW2-0 (Bits 7, 6 and 5 of IRRXDC)
010
011
100
363.63
444.44
417.39
505.26
436.36
533.33
347.82
470.58
400.00
533.33
417.39
564.70
333.33
500.00
384.00
564.70
400.00
600.00
101
320.00
533.33
369.23
600.00
384.00
640.00
110
307.69
571.42
355.55
640.00
369.92
685.57
TABLE 7-27. Sharp-IR Demodulator (Frequency Ranges in kHz)
DFR Bits
4 3 2 1 0 _min/max
min
xxxxxx
max
001
480.0
533.3
DBW2-0 (Bits 7, 6 and 5 of IRRXDC)
010
011
100
457.1
564.7
436.4
600.0
417.4
640.0
101
400.0
685.6
110
384.0
738.5
TABLE 7-28. Consumer-IR Carrier Frequency
Encoding
Encoding
MCFR Bits
43210
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
...
11010
11011
Low Frequency
(TXHSC = 0)
reserved
reserved
reserved
30 KHz
31 KHz
32 KHz
33 KHz
34 KHz
35 KHz
36 KHz
37 KHz
38 KHz
39 KHz
40 KHz
41 KHz
...
53 KHz
54 KHz
High Frequency
(TXHSC = 1)
reserved
reserved
reserved
400 KHz
reserved
reserved
reserved
reserved
450 KHz
reserved
reserved
480 KHz
reserved
reserved
reserved
...
reserved
reserved
Encoding
MCFR Bits
43210
11100
11101
11110
11111
Low Frequency
(TXHSC = 0)
55 KHz
56 KHz
56.9 KHz
reserved
High Frequency
(TXHSC = 1)
reserved
reserved
reserved
reserved
TABLE 7-29. Carrier Clock Pulse Width Options
Encoding
MCPW Bits
765
000
001
010
011
100
101
110
111
Low Frequency
(TXHSC = 0)
Reserved
Reserved
6 µsec
7 µsec
9 µsec
10.6 µsec
Reserved
Reserved
High Frequency
(TXHSC = 1)
Reserved
Reserved
0.7 µsec
0.8 µsec
0.9 µsec
Reserved
Reserved
Reserved
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