External Clock Input - Renesas H8/3067 Series User Manual

19.2.2

External Clock Input

Circuit Configuration: An external clock signal can be input as shown in the examples in figure
19.5. If the XTAL pin is left open, the stray capacitance should not exceed 10 pF. If the stray
capacitance at the XTAL pin exceeds 10 pF in configuration a, use configuration b instead and
hold the clock high in standby mode.
EXTAL
XTAL
EXTAL
XTAL
a. XTAL pin left open
b. Complementary clock input at XTAL pin
Figure 19.5 External Clock Input (Examples)
Section 19 Clock Pulse Generator
External clock input
Open
External clock input
Rev. 4.00 Jan 26, 2006 page 669 of 938
REJ09B0276-0400