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PCD3349 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCD3349 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 20 page 1998 May 11 6 Philips Semiconductors Product specification 8-bit microcontroller with DTMF generator PCD3349A 6 FREQUENCY GENERATOR A versatile frequency generator section is provided (see Fig.3). For normal operation, use a 3.58 MHz quartz crystal or PXE resonator. The frequency generator includes precision circuitry for dual tone multifrequency (DTMF) signals, which is typically used for tone dialling telephone sets. The TONE output can alternatively issue twelve modem frequencies for data rates between 300 and 1200 bits/s. In addition to DTMF and modem frequencies, two octaves of musical scale in steps of semitones are available. 6.1 Frequency generator derivative registers Table 2 gives the derivative addresses, mnemonics and access types of the frequency generator derivative registers. The addresses 03H to FFH are not used. Table 2 Addresses of the frequency generator derivative registers Notes 1. HGF = High Group Frequency; access type W. 2. LGF = Low Group Frequency; access type W. ADDRESS REGISTER 7 6 5 4 3 2 1 0 01H HGF(1) H7 H6 H5 H4 H3 H2 H1 H0 02H LGF(2) L7 L6 L5 L4 L3 L2 L1 L0 Fig.3 Block diagram of the frequency generator section. dbook, full pagewidth HGF REGISTER MBG099 DIGITAL SINE WAVE SYNTHESIZER 8 SWITCHED- CAPACITOR BANDGAP VOLTAGE REFERENCE DAC DAC LGF REGISTER DIGITAL SINE WAVE SYNTHESIZER 8 8 internal bus SWITCHED- CAPACITOR LOW-PASS FILTER RC LOW-PASS FILTER TONE |
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