External Clock Input; Figure 19.4 External Clock Input (Examples); Table 19.2 Crystal Resonator Characteristics - Renesas H8S Series Hardware Manual

Table 19.2 Crystal Resonator Characteristics

Frequency (MHz)
R max (Ω)
S
C max (pF)
0
19.2.2

External Clock Input

Circuit Configuration: An external clock signal can be input as shown in the examples in figure
19.4. 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
EXTAL
XTAL
4 8
120 80
7 7
(a) XTAL pin left open
(b) Complementary clock input at XTAL pin

Figure 19.4 External Clock Input (Examples)

Section 19 Clock Pulse Generator
10 12
70 60
7 7
External clock input
Open
External clock input
Rev. 6.00 Mar 15, 2006 page 485 of 570
16 20
50 40
7 7
REJ09B0211-0600