HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 154

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

Input of External Clock Signal
(1) Circuit Configuration: An external clock signal can be input at the EXTAL and XTAL pins
Note: When using make ROM, an external clock can be input at the EXTAL pin while leaving
as shown in the example in figure 8-5.
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.
Figure 8-4 Notes on Board Design around External Crystal
Not allowed
C
C
L2
L1
Figure 8-5 External Clock Input (Example)
EXTAL
XTAL
Signal A
74HC04
137
Signal B
External clock input
XTAL
EXTAL
H8/532