HD6432670 Hitachi, HD6432670 Datasheet - Page 827

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

21.2.2
An external clock signal can be input as shown in the examples in figure 21.4. If the XTAL pin is
left open, make sure that parasitic capacitance is no more than 10 pF. When the counter clock is
input to the XTAL pin, make sure that the external clock is held high in standby mode.
Table 21.3 shows the input conditions for the external clock
External Clock Input
EXTAL
EXTAL
XTAL
XTAL
Figure 21.4 External Clock Input (Examples)
(b) Counter clock input at XTAL pin
(a) XTAL pin left open
Open
External clock input
External clock input
Rev. 2.0, 04/02, page 781 of 906