M38203M4 Datasheet, PDF (277/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.11 Oscillation circuit
(2) External clock input circuit
An external clock can also be supplied to the main clock oscillation circuit.
Figure 2.11.2 shows an external clock input circuit example. As an external clock to be input to the
XIN pin, use a pulse signal with a duty ratio of 50%. At this time, open the XOUT pin.
Any clock externally generated cannot be input to the XCIN pin directly. Cause oscillation with an
external ceramic resonator.
3820 group
XCIN
XCOUT
28
Rf ²⁹
XIN
30
XOUT
31
Open
Rd
External oscillation circuit
CCIN
CCOUT
VCC
VSS
Fig. 2.11.2 External clock input circuit example
3820 GROUP USER’S MANUAL
2–191