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23.3.2
External Clock Input
Circuit Configuration: An external clock signal can be input as shown in the examples in figure
23-6. If the XTAL pin is left open, make sure that stray capacitance is no more than 10 pF.
In example (b), make sure that the external clock is held high in standby mode.
EXTAL
EXTAL
XTAL
XTAL
(b) Complementary clock input at XTAL pin
Figure 23-6 External Clock Input (Examples)
Open
(a) XTAL pin left open
External clock input
External clock input
847
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