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T48C862-R8 数据表(PDF) 27 Page - ATMEL Corporation |
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T48C862-R8 数据表(HTML) 27 Page - ATMEL Corporation |
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27 / 107 page  27 T48C862-R8 4590B–4BMCU–02/03 Figure 23. RC-oscillator 2 4-MHz Oscillator The microcontroller block 4-MHz oscillator options need a crystal or ceramic resonator connected to the OSC1 and OSC2 pins to establish oscillation. All the necessary oscilla- tor circuitry is integrated, except the actual crystal, resonator, C3 and C4. 4-MHz Crystal Oscillator Figure 24. Ceramic Resonator 32-kHz Oscillator Some applications require long-term time keeping or low resolution timing. In this case, an on-chip, low power 32-kHz crystal oscillator can be used to generate both the SUBCL and the SYSCL. In this mode, power consumption is greatly reduced. The 32-kHz crystal oscillator can not be stopped while the power-down mode is in operation. RC oscillator 2 RcOut2 Stop RcOut2 Osc-Stop R Trim OSC1 OSC2 R ext V DD 4-MHz oscillator 4Out 4Out OSC1 OSC2 * Oscin C1 * C2 Oscout XTAL 4 MHz * Configurable Stop Osc-Stop 4-MHz oscillator 4Out Stop 4Out Osc-Stop OSC1 OSC2 * Oscin C1 * C2 Oscout Cer. Res * Configurable C3 C4 |
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