C868 Datasheet, PDF (24/82 Pages) Infineon Technologies AG – 8-Bit Single-Chip Microcontroller

C868
XTAL1
*)
C₁
C₂
C868
XTAL2
To internal
timing circuitry
*) Crystal or ceramic resonator
Figure 13 On-Chip Oscillator Circuitry
To drive the C868 with an external clock source, the external clock signal has to be
applied to XTAL2, as shown in Figure 14. XTAL1 has to be left unconnected. A pullup
resistor is suggested (to increase the noise margin), but is optional if V_OH of the driving
gate corresponds to the V_IH2 specification of XTAL2.
V_DDC
N.C.
C868
XTAL1
External
Clock
Signal
XTAL2
Figure 14 External Clock Source
Data Sheet
24
V 1.0, 2003-05