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參數資料
| 型號： | PCD3359AT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontroller with DTMF generator and 128 bytes EEPROM |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 7.50 MM, PLASTIC, SO-28 |
| 文件頁數： | 10/32頁 |
| 文件大小： | 165K |
| 代理商： | PCD3359AT |
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1998 May 11
10
Philips Semiconductors
Product specification
8-bit microcontroller with DTMF
generator and 128 bytes EEPROM
PCD3359A
6.4
DTMF frequencies
Assuming an oscillator frequency f
xtal
= 3.58 MHz, the
DTMF standard frequencies can be implemented as
shown in Table 7.
The relationships between telephone keyboard symbols,
DTMF frequency pairs and the frequency register contents
are given in Table 8.
Table 7
DTMF standard frequencies and their
implementation; value = LGF, HGF contents
Table 8
Dialling symbols, corresponding DTMF
frequency pairs and frequency register contents
VALUE
(HEX)
FREQUENCY (Hz)
DEVIATION
STANDARD
GENERATED
(%)
(Hz)
DD
C8
B5
A3
7F
72
67
5D
697
770
852
941
1209
1336
1477
1633
697.90
770.46
850.45
943.23
1206.45
1341.66
1482.21
1638.24
0.13
0.06
0.18
0.24
0.21
0.42
0.35
0.32
0.90
0.46
1.55
2.23
2.55
5.66
5.21
5.24
TELEPHONE
KEYBOARD
SYMBOLS
DTMF FREQ.
PAIRS
(Hz)
LGF
VALUE
(HEX)
HGF
VALUE
(HEX)
0
1
2
3
4
5
6
7
8
9
A
B
C
D
#
(941, 1336)
(697, 1209)
(697, 1336)
(697, 1477)
(770, 1209)
(770, 1336)
(770, 1477)
(852, 1209)
(852, 1336)
(852, 1477)
(697, 1633)
(770, 1633)
(852, 1633)
(941, 1633)
(941, 1209)
(941, 1477)
A3
DD
DD
DD
C8
C8
C8
B5
B5
B5
DD
C8
B5
A3
A3
A3
72
7F
72
67
7F
72
67
7F
72
67
5D
5D
5D
5D
7F
67
6.5
Modem frequencies
Again assuming an oscillator frequency f
xtal
= 3.58 MHz,
the standard modem frequencies can be implemented as
in Table 9. It is suggested to define the frequency by the
HGF register while the LGF register contains 00H,
disabling Low Group Frequency generation.
Table 9
Standard modem frequencies and their
implementation
Notes
1.
2.
3.
4.
Standard is V.21.
Standard is Bell 103.
Standard is Bell 202.
Standard is V.23.
HGF
VALUE
(HEX)
FREQUENCY (Hz)
DEVIATION
MODEM
GENERATED
(%)
(Hz)
9D
82
8F
79
80
45
76
48
5C
52
4B
44
980
(1)
1180
(1)
1070
(2)
1270
(2)
1200
(3)
2200
(3)
1300
(4)
2100
(4)
1650
(1)
1850
(1)
2025
(2)
2225
(2)
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
0.08
0.31
0.37
0.24
0.36
0.24
0.15
0.34
0.15
0.19
0.08
1.18
0.97
3.33
4.70
2.83
7.99
3.06
3.14
5.66
2.77
3.80
1.68
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