HD6432621 Hitachi, HD6432621 Datasheet - Page 726

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

20.3.2
Circuit Configuration: An external clock signal can be input as shown in the examples in figure
20-6. 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.
682
External Clock Input
EXTAL
EXTAL
XTAL
XTAL
Figure 20-6 External Clock Input (Examples)
(b) Complementary clock input at XTAL pin
(a) XTAL pin left open
Open
External clock input
External clock input