External Clock Input - Renesas Hitachi H8S/2194 Series Hardware Manual

10.3.2

External Clock Input

(1) Circuit Configuration
An external clock signal can be input as shown in the examples in figure 10.5. If the OSC2
pin is left open, make sure that stray capacitance is no more than 10 pF.
In example (b), make sure that the external clock is held high in standby mode, subactive
mode, subsleep mode, and watch mode.
OSC1
OSC2
OSC1
OSC2
Rev. 2.0, 11/00, page 228 of 1037
(a) OSC2 pin left open
(b) Completely clock input at OSC2 pin
Figure 10.5 External Clock Input (Examples)
External clock input
Open
External clock input