PCD3354AH Просмотр технического описания (PDF) - Philips Electronics

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PCD3354AH

8-bit microcontrollers with DTMF generator and 256 bytes EEPROM

Philips Electronics 

Philips Semiconductors

8-bit microcontrollers with DTMF

generator and 256 bytes EEPROM

Product specification

PCA3354C; PCD3354A

6.6 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

HGF

VALUE

(HEX)

FREQUENCY (Hz)

MODEM GENERATED

9D

980(1)

978.82

82 1180(1)

1 179.03

8F 1070(2)

1 073.33

79 1270(2)

1 265.30

80 1200(3)

1 197.17

45 2200(3)

2 192.01

76 1300(4)

1 296.94

48 2100(4)

2 103.14

5C 1650(1)

1 655.66

52 1850(1)

1 852.77

4B 2025(2)

2 021.20

44 2225(2)

2 223.32

DEVIATION

(%) (Hz)

−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.

6.7 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 9). It is suggested to define the

frequency by the HGF register while the LGF contains

00H, disabling Low Group Frequency generation.

Table 9 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

1 046.5

1 108.7

1 174.7

1 244.5

1 318.5

1 396.9

1 480.0

1 568.0

1 661.2

1 760.0

1 864.7

1 975.5

2 093.0

2 217.5

2 349.3

2 489.0

622.5

659.5

697.9

741.1

782.1

832.3

879.3

931.9

985.0

1 044.5

1 111.7

1 179.0

1 245.1

1 318.9

1 402.1

1 482.2

1 572.0

1 655.7

1 768.5

1 875.1

1 970.0

2 103.3

2 223.3

2 358.1

2 470.4

Note

1. Standard scale based on A4 @ 440 Hz.

1996 Dec 18

10

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