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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M38045FFHKP датащи(PDF) 259 Page - Renesas Technology Corp |
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M38045FFHKP датащи(HTML) 259 Page - Renesas Technology Corp |
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259 / 387 page  2-135 APPLICATION 2.8 D/A converter Rev.1.00 Jan 14, 2005 REJ09B0212-0100Z 3804 Group (Spec.H) 2.8.3 D/A converter application example (1) Speaker output volume modulation Outline: The volume of a speaker output is modulated by using D/A converter. Specifications: •Timer X modulates the period of sound for the pitch interval, so that a fixed pitch (“la”: approx. 440 Hz) can be output. Modulating the amplitude with the D/A output value controls the volume. •Use f(XIN) = 6 MHz. •Use DA1 (P30/DA1 pin) as D/A converter. Figure 2.8.5 shows a peripheral circuit example and Figure 2.8.6 shows a speaker output example. Figure 2.8.7 shows the relevant registers setting. Fig. 2.8.5 Peripheral circuit example Fig. 2.8.6 Speaker output example Amplification circuit Power amplifier 3804 Group (Spec. H) + P30/DA1 VREF VSS Timer X interrupt Timer X interrupt Timer X interrupt Timer X interrupt Timer X interrupt Timer X interrupt Modulation of volume (amplitude is set by D/A1 output) Modulation of pitch interval: 440 Hz (Cycle is set by timer X) |
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