External Clock Input; Figure 20.4 External Clock Input (Examples) - Hitachi H8S/2628 Hardware Manual

20.2.2

External Clock Input

Circuit Configuration: An external clock signal can be input as shown in the examples in figure
20.4. If the XTAL pin is left open, ensure that stray capacitance does not exceed 10 pF. When
complementary clock is input to the XTAL pin, the external clock input should be fixed high in
standby mode.
EXTAL
XTAL
(a) XTAL pin left open
EXTAL
XTAL
(b) Complementary clock input at XTAL pin

Figure 20.4 External Clock Input (Examples)

External clock input
Open
External clock input
Rev. 1.0, 09/02, page 471 of 568