In order to drive the chip from an external clock source, XTAL1 must be connected as shown in Figure 21. At the same time, the fuse bit CKSEL must be programmed to “0000”. If the fuse bit CKOPT is also programmed, the user can use the internal 36 pF capacitor between XTAL1 and GND.
After selecting this oscillator, the start-up time is determined by the fuse bits SUT as shown in Table 16.
In order to ensure that the MCU can work stably, the oscillation frequency of the external clock source cannot be changed suddenly. A sudden change of the operating frequency exceeding 2% will cause abnormal phenomena. The oscillation frequency of the external clock should be changed when the MCU is in reset state.
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