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PCD3349AP Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCD3349AP Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  1998 May 11 8 Philips Semiconductors Product specification 8-bit microcontroller with DTMF generator 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 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. HGF VALU E (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 Table 6 Musical scale frequencies and their implementation Note 1. Standard scale based on A4 at 440 Hz. NOTE HGF VALUE (HEX) FREQUENCY (Hz) STANDARD(1) GENERATED D#5 F8 622.3 622.5 E5 EA 659.3 659.5 F5 DD 698.5 697.9 F#5 D0 740.0 741.1 G5 C5 784.0 782.1 G#5 B9 830.6 832.3 A5 AF 880.0 879.3 A#5 A5 923.3 931.9 B5 9C 987.8 985.0 C6 93 1046.5 1044.5 C#6 8A 1108.7 1111.7 D6 82 1174.7 1179.0 D#6 7B 1244.5 1245.1 E6 74 1318.5 1318.9 F6 6D 1396.9 1402.1 F#6 67 1480.0 1482.2 G6 61 1568.0 1572.0 G#6 5C 1661.2 1655.7 A6 56 1760.0 1768.5 A#6 51 1864.7 1875.1 B6 4D 1975.5 1970.0 C7 48 2093.0 2103.3 C#7 44 2217.5 2223.3 D7 40 2349.3 2358.1 D#7 3D 2489.0 2470.4 |
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