3.2 External Clock Input - Renesas H8S/2633 Series Hardware Manual

23A.3.2 External Clock Input
Circuit Configuration: An external clock signal can be input as shown in the examples in figure
23A-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
XTAL
EXTAL
XTAL
(a) XTAL pin left open
(b) Complementary clock input at XTAL pin
Figure 23A-6 External Clock Input (Examples)
External clock input
Open
External clock input
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