C515C_9711 Datasheet, PDF (61/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Reset / System Clock
C515C
C515C
XTAL1
1)
C₁
C₂
1) _{Crystal or Ceramic Resonator}
To Internal
Timing Circuitry
XTAL2
MCS02724
Figure 5-5
On-Chip Oscillator Circuitry
To drive the C515C with an external clock source, the external clock signal has to be applied to
XTAL2, as shown in figure 5-6. 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.
External
Clock Signal
Figure 5-6
External Clock Source
V_CC
N.C.
C515C
XTAL1
XTAL2
MCS02725
Semiconductor Group
5-7
1997-11-01