Input of External Clock Signal
(1) Circuit Configuration: An external clock signal can be input at the EXTAL and XTAL pins
as shown in the example in figure 8-5.
Note: When using make ROM, an external clock can be input at the EXTAL pin while leaving
the XTAL pin open. Also when using ZTAT, an external clock under 16 MHz can be input
at the EXTAL pin while leaving the XTAL pin open.
CL2
CL1
Not allowed
Signal A Signal B
H8/532
XTAL
EXTAL
External clock input
74HC04
EXTAL
XTAL
Figure 8-4 Notes on Board Design around External Crystal
Figure 8-5 External Clock Input (Example)
137
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