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SI3201-GS Datasheet(PDF) 34 Page - Silicon Laboratories |
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SI3201-GS Datasheet(HTML) 34 Page - Silicon Laboratories |
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34 / 118 page  Si3215 34 Rev. 0.92 counting until the inactive timer expires. The cadence continues until the user clears the O1TAE and O1TIE control bits. The zero crossing detect feature can be implemented by setting the OZ1 bit (direct Register 32, bit 5). This ensures that each oscillator pulse ends without a dc component. The timing diagram in Figure 19 is an example of an output cadence using the zero crossing feature. One-shot oscillation can be achieved by enabling O1E and O1TAE. Direct control over the cadence can be achieved by controlling the O1E bit (direct Register 32, bit 2) directly if O1TAE and O1TIE are disabled. The operation of tone generator 2 is identical to that of tone generator 1 using its respective control registers. Note: Tone Generator 2 should not be enabled simulta- neously with the ringing oscillator due to resource shar- ing within the hardware. Continuous-phase frequency-shift keying (FSK) waveforms may be created using tone generator 1 (not available on tone generator 2) by setting the REL bit (direct Register 32, bit 6), which enables reloading of the OSC1, OSC1X, and OSC1Y registers at the expiration of the active timer (OAT1). Table 27. Associated Tone Generator Registers Tone Generator 1 Parameter Description / Range Register Bits Location Oscillator 1 Frequency Coefficient Sets oscillator frequency OSC1[15:0] Indirect Register 0 Oscillator 1 Amplitude Coefficient Sets oscillator amplitude OSC1X[15:0] Indirect Register 1 Oscillator 1 initial phase coefficient Sets initial phase OSC1Y[15:0] Indirect Register 2 Oscillator 1 Active Timer 0 to 8 seconds OAT1[15:0] Direct Registers 36 & 37 Oscillator 1 Inactive Timer 0 to 8 seconds OIT1[15:0] Direct Register 38 & 39 Oscillator 1 Control Status and control registers OSS1, REL, OZ1, O1TAE, O1TIE, O1E, O1SO[1:0] Direct Register 32 Tone Generator 2 Parameter Description/Range Register Location Oscillator 2 Frequency Coefficient Sets oscillator frequency OSC2[15:0] Indirect Register 3 Oscillator 2 Amplitude Coefficient Sets oscillator amplitude OSC2X[15:0] Indirect Register 4 Oscillator 2 initial phase coefficient Sets initial phase OSC2Y[15:0] Indirect Register 5 Oscillator 2 Active Timer 0 to 8 seconds OAT2[15:0] Direct Registers 40 & 41 Oscillator 2 Inactive Timer 0 to 8 seconds OIT2[15:0] Direct Register 42 & 43 Oscillator 2 Control Status and control registers OSS2, OZ2, O2TAE, O2TIE, O2E, O2SO[1:0] Direct Register 33 |
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Similar Description - SI3201-GS |
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