PCD3349 Просмотр технического описания (PDF) - Philips Electronics
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PCD3349 Datasheet PDF : 20 Pages
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Philips Semiconductors
8-bit microcontroller with DTMF generator
Product specification
PCD3349A
6.4 Modem frequencies
Again assuming an oscillator frequency fxtal = 3.58 MHz,
the standard modem frequency pairs summarized in
Table 5 can be implemented. It is suggested to define the
frequency by the HGF register while the LGF register
contains 00H, disabling Low Group Frequency generation.
Table 5 Standard modem frequency pairs and their
implementation
HGF
VALU
E
(HEX)
9D
82
8F
79
80
45
76
48
5C
52
4B
44
FREQUENCY (Hz)
DEVIATION
MODEM
980(1)
1180(1)
1070(2)
1270(2)
1200(3)
2200(3)
1300(4)
2100(4)
1650(1)
1850(1)
2025(2)
2225(2)
GENERATED (%) (Hz)
978.82
1179.03
1073.33
1265.30
1197.17
2192.01
1296.94
2103.14
1655.66
1852.77
2021.20
2223.32
−0.12 −1.18
−0.08 −0.97
0.31 3.33
−0.37 −4.70
−0.24 −2.83
−0.36 −7.99
−0.24 −3.06
0.15 3.14
0.34 5.66
0.15 2.77
−0.19 −3.80
−0.08 −1.68
Notes
1. Standard is V.21.
2. Standard is Bell 103.
3. Standard is Bell 202.
4. Standard is V.23.
6.5 Musical scale frequencies
Finally, two octaves of musical scale in steps of semitones
can be realized, again assuming an oscillator frequency
fxtal = 3.58 MHz (Table 6). It is suggested to define the
frequency by the HGF register while the LGF contains
00H, disabling Low Group Frequency generation.
Table 6 Musical scale frequencies and their
implementation
NOTE
D#5
E5
F5
F#5
G5
G#5
A5
A#5
B5
C6
C#6
D6
D#6
E6
F6
F#6
G6
G#6
A6
A#6
B6
C7
C#7
D7
D#7
HGF
VALUE
(HEX)
F8
EA
DD
D0
C5
B9
AF
A5
9C
93
8A
82
7B
74
6D
67
61
5C
56
51
4D
48
44
40
3D
FREQUENCY (Hz)
STANDARD(1) GENERATED
622.3
659.3
698.5
740.0
784.0
830.6
880.0
923.3
987.8
1046.5
1108.7
1174.7
1244.5
1318.5
1396.9
1480.0
1568.0
1661.2
1760.0
1864.7
1975.5
2093.0
2217.5
2349.3
2489.0
622.5
659.5
697.9
741.1
782.1
832.3
879.3
931.9
985.0
1044.5
1111.7
1179.0
1245.1
1318.9
1402.1
1482.2
1572.0
1655.7
1768.5
1875.1
1970.0
2103.3
2223.3
2358.1
2470.4
Note
1. Standard scale based on A4 at 440 Hz.
1998 May 11
8
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