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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATAR080 датащи(PDF) 16 Page - ATMEL Corporation |
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ATAR080 датащи(HTML) 16 Page - ATMEL Corporation |
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16 / 68 page  16 ATAR080 4675D–4BMCU–12/04 RC-oscillator 2 with External Trimming Resistor The RC-oscillator 2 is a high resolution trimmable oscillator whereby the oscillator fre- quency can be trimmed with an external resistor between OSC1 and VSS. In this configuration, the RC-oscillator 2 frequency can be maintained stable to within a toler- ance of ±15% over the full operating temperature and voltage range from V DD = 2.0 V to 6.5 V. For example: An output frequency at the RC-oscillator 2 of 1.6 MHz, can be obtained by connecting a resistor R ext = 47 kΩ (see Figure 17). Figure 17. RC-oscillator 2 4-MHz Oscillator The ATAR080 4-MHz oscillator options need a crystal or ceramic resonator connected to the OSC1 and OSC2 pins to establish oscillation. All the necessary oscillator circuitry is integrated, with the exception of the actual crystal, resonator and the capacitors C 1 and C 2. Figure 18. 4-MHz Crystal Oscillator Note: Both, the 4-MHz and the 32-kHz crystal oscillator, use an integrated 14 stage divider cir- cuit to stabilize oscillation before the oscillator output is used as system clock. This results in an additional delay of about 4 ms for the 4-MHz crystal and about 500 ms for the 32-kHz crystal. RC-oscillator 2 RcOut2 Stop RcOut2 Osc-Stop R Trim OSC1 R ext 4-MHz oscillator 4Out Stop 4Out Osc-Stop OSC1 OSC2 Oscin Oscout XTAL 4 MHz C 1 C 2 |
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