HD6475328-CP10 Datasheet, PDF (154/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Not allowed
CL2
Signal A Signal B
H8/532
XTAL
EXTAL
CL1
Figure 8-4 Notes on Board Design around External Crystal
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.
EXTAL
XTAL
74HC04
External clock input
Figure 8-5 External Clock Input (Example)
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.
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