Siemens SAB 80515 Series User Manual page 109

On-Chip Peripheral Components
7.8.2.2 Driving the SAB 80C515/80C535 from External Source
For driving the SAB 80C515/80C535 from an external clock source, the external clock signal is to
be applied to XTAL2, as shown in figure 7-52. A pullup resistor is recommended, but is optional if
the output high level of the driving gate corresponds to the V
specification of XTAL2.
IH1
XTAL1 has to be left unconnected.
*
Figure 7-51
On-Chip Oscillator Circuitry
Figure 7-52
External Clock Source
Semiconductor Group 109