PCD3351AP datasheet(11/36 Pages) PHILIPS

11 / 36 page

1999 Oct 28

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with DTMF generator

and 128 bytes EEPROM

PCA3351C; 52C; 53C;

PCD3351A; 52A; 53A

6.5

Modem frequencies

Again assuming an oscillator frequency fxtal = 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. Standard is V.21.

2. Standard is Bell 103.

3. Standard is Bell 202.

4. Standard is V.23.

6.6

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 10). It is suggested to define the

frequency by the HGF register while the LGF contains

00H, disabling Low Group Frequency generation

Table 10 Musical scale frequencies and their

implementation

Note

1. Standard scale based on A4 @ 440 Hz.

HGF

VALUE

(HEX)

FREQUENCY (Hz)

DEVIATION

MODEM

GENERATED

(%)

(Hz)

980(1)

978.82

−0.12 −1.18

1180(1)

1179.03

−0.08 −0.97

1070(2)

1073.33

0.31

3.33

1270(2)

1265.30

−0.37 −4.70

1200(3)

1197.17

−0.24 −2.83

2200(3)

2192.01

−0.36 −7.99

1300(4)

1296.94

−0.24 −3.06

2100(4)

2103.14

0.15

3.14

1650(1)

1655.66

0.34

5.66

1850(1)

1852.77

0.15

2.77

2025(2)

2021.20

−0.19 −3.80

2225(2)

2223.32

−0.08 −1.68

NOTE

HGF

VALUE

(HEX)

FREQUENCY (Hz)

STANDARD(1)

GENERATED

D#5

622.3

622.5

659.3

659.5

698.5

697.9

F#5

740.0

741.1

784.0

782.1

G#5

830.6

832.3

880.0

879.3

A#5

923.3

931.9

987.8

985.0

1046.5

1044.5

C#6

1108.7

1111.7

1174.7

1179.0

D#6

1244.5

1245.1

1318.5

1318.9

1396.9

1402.1

F#6

1480.0

1482.2

1568.0

1572.0

G#6

1661.2

1655.7

1760.0

1768.5

A#6

1864.7

1875.1

1975.5

1970.0

2093.0

2103.3

C#7

2217.5

2223.3

2349.3

2358.1

D#7

2489.0

2470.4

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