External Clock Input - Hitachi H8/3006 Hardware Manual

18.2.2

External Clock Input

Circuit Configuration: An external clock signal can be input as shown in the examples in figure
18.5. If the XTAL pin is left open, the stray capacitance should not exceed 10 pF. If the stray
capacitance at the XTAL pin exceeds 10 pF, use configuration b instead and hold the clock high in
standby mode.
EXTAL
XTAL
EXTAL
XTAL
552
a. XTAL pin left open
b. Complementary clock input at XTAL pin
Figure 18.5 External Clock Input (Examples)
External clock input
Open
External clock input