HD6413008VF25 Datasheet, PDF (497/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Avoid
C _L2
Signal A Signal B
17. Clock Pulse Generator
H8/3008
XTAL
C _L1
EXTAL
Figure 17.4 Oscillator Circuit Block Board Design Precautions
17.2.2 External Clock Input
Circuit Configuration: An external clock signal can be input as shown in the examples in figure
17.5. 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 the connection shown in
configuration b instead, and hold the external clock high in standby mode.
EXTAL
XTAL
Open
External clock input
a. XTAL pin left open
EXTAL
XTAL
External clock input
b. Complementary clock input at XTAL pin
Figure 17.5 External Clock Input (Examples)
Rev.4.00 Aug. 20, 2007 Page 451 of 638
REJ09B0395-0400