HD6473032F16 Datasheet, PDF (641/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Avoid
C _L2
Signal A
Section 19 Clock Pulse Generator
Signal B
H8/3052BF
XTAL
EXTAL
C _L1
Figure 19.4 Example of Incorrect Board Design
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
Open
a. XTAL pin left open
External clock input
EXTAL
XTAL
74HC04
External clock input
b. Complementary clock input at XTAL pin
Figure 19.5 External Clock Input (Examples)
Rev. 3.00 Mar 21, 2006 page 611 of 814
REJ09B0302-0300