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ATMEGA323-8PI Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATMEGA323-8PI Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 247 page 6 ATmega323(L) 1457G–AVR–09/03 Clock Options The device has the following clock source options, selectable by Flash Fuse bits as shown: Note: 1. “1” means unprogrammed, “0” means programmed. The various choices for each clocking option give different start-up times as shown in Table 6 on page 27. Internal RC Oscillator The internal RC Oscillator option is an On-chip Oscillator running at a fixed frequency of nominally 1 MHz. If selected, the device can operate with no external components. See “Calibrated Internal RC Oscillator” on page 41 for information on calibrating this Oscillator. Crystal Oscillator XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as an On-chip Oscillator, as shown in Figure 2. Either a quartz crystal or a ceramic resonator may be used. Figure 2. Oscillator Connections Table 1. Device Clocking Options Select (1) Device Clocking Option CKSEL3..0 External Crystal/Ceramic Resonator 1111 - 1010 External Low-frequency Crystal 1001 - 1000 External RC Oscillator 0111 - 0101 Internal RC Oscillator 0100 - 0010 External Clock 0001 - 0000 XTAL2 XTAL1 GND C2 C1 |
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