參數(shù)資料
型號(hào)： 935196500112
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDIP28
封裝： 0.600 INCH, PLASTIC, DIP-28
文件頁(yè)數(shù)： 2/35頁(yè)
文件大?。?/td> 243K
代理商： 935196500112
1997 Apr 16
10
Philips Semiconductors
Product specication
8-bit microcontrollers with DTMF generator,
8 kbytes OTP and 128 bytes EEPROM
PCD3755A; PCD3755E;
PCD3755F
6.4
DTMF frequencies
Assuming an oscillator frequency fxtal = 3.58 MHz, the
DTMF standard frequencies can be implemented as
shown in Table 6.
The relationships between telephone keyboard symbols,
DTMF frequency pairs and the frequency register contents
are given in Table 7.
Table 6
DTMF standard frequencies and their
implementation; value = LGF, HGF contents
Table 7
Dialling symbols, corresponding DTMF
frequency pairs and frequency register contents
VALUE
(HEX)
FREQUENCY (Hz)
DEVIATION
STANDARD
GENERATED
(%)
(Hz)
DD
697
697.90
0.13
0.90
C8
770
770.46
0.06
0.46
B5
852
850.45
0.18 1.55
A3
941
943.23
0.24
2.23
7F
1209
1206.45
0.21 2.55
72
1336
1341.66
0.42
5.66
67
1477
1482.21
0.35
5.21
5D
1633
1638.24
0.32
5.24
TELEPHONE
KEYBOARD
SYMBOLS
DTMF FREQ.
PAIRS
(Hz)
LGF
VALUE
(HEX)
HGF
VALUE
(HEX)
0
(941, 1336)
A3
72
1
(697, 1209)
DD
7F
2
(697, 1336)
DD
72
3
(697, 1477)
DD
67
4
(770, 1209)
C8
7F
5
(770, 1336)
C8
72
6
(770, 1477)
C8
67
7
(852, 1209)
B5
7F
8
(852, 1336)
B5
72
9
(852, 1477)
B5
67
A
(697, 1633)
DD
5D
B
(770, 1633)
C8
5D
C
(852, 1633)
B5
5D
D
(941, 1633)
A3
5D
(941, 1209)
A3
7F
#
(941, 1477)
A3
67
6.5
Modem frequencies
Again assuming an oscillator frequency fxtal = 3.58 MHz,
the standard modem frequencies can be implemented as
in Table 8. It is suggested to define the frequency by the
HGF register while the LGF register contains 00H,
disabling Low Group Frequency generation.
Table 8
Standard modem frequencies and their
implementation
Notes
1. Standard is V.21.
2. Standard is Bell 103.
3. Standard is Bell 202.
4. Standard is V.23.
HGF
VALUE
(HEX)
FREQUENCY (Hz)
DEVIATION
MODEM
GENERATED
(%)
(Hz)
9D
980(1)
978.82
0.12 1.18
82
1180(1)
1179.03
0.08 0.97
8F
1070(2)
1073.33
0.31
3.33
79
1270(2)
1265.30
0.37 4.70
80
1200(3)
1197.17
0.24 2.83
45
2200(3)
2192.01
0.36 7.99
76
1300(4)
1296.94
0.24 3.06
48
2100(4)
2103.14
0.15
3.14
5C
1650(1)
1655.66
0.34
5.66
52
1850(1)
1852.77
0.15
2.77
4B
2025(2)
2021.20
0.19 3.80
44
2225(2)
2223.32
0.08 1.68
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