C515A_9708 Datasheet, PDF (49/182 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Reset / System Clock
C515A
Figure 5-10
On-Chip Oscillator Circuiry
To drive the C515A with an external clock source, the external clock signal has to be applied to
XTAL2, as shown in figure 5-11. 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.
Figure 5-11
External Clock Source
Semiconductor Group
5-7
1997-08-01