HD6475348R Datasheet, PDF (156/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

(3) Circuit Configuration (HD6475368S, HD6475348S, HD6435368S, HD6435348S): Figure
8-6 shows examples of external clock input. When using figure 8-6 (b), make sure the external
clock does not go high during standby mode. When the XTAL pin is open, make sure the
parasitic capacifance is less than 10 pF.
EXTAL
XTAL
External clock input
Open
(a) XTAL pin left open
EXTAL
XTAL
74HC04
External clock input
(b) Complementary clock input at XTAL pin
Figure 8-6 External Clock Input (Examples)
(4) External Clock Input
Frequency
Duty cycle
Double the system clock (ø) frequency
40% to 60%
138