sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 176

• Manufacturer Part Number: sak-c868p-1rr
• Description: 8 - Bit Cmos Microcontroller
• Manufacturer: Infineon Technologies Corporation

5.7
XTAL2 and XTAL1 are the input and output of a single-stage on-chip inverter which can
be configured with off-chip components as a Pierce oscillator. The oscillator, in any case,
drives the internal clock generator. The clock generator provides the internal clock
signals to the chip. These signals define the internal phases, states and machine cycles.
Figure 5-5
Figure 5-5
In this application the on-chip oscillator is used as a crystal-controlled, positive-
reactance oscillator (a more detailed schematic is given in
its fundamental response mode as an inductive reactor in parallel resonance with a
capacitor external to the chip. The crystal specifications and capacitances are non-
critical. In this circuit tbd pF can be used as single capacitance at any frequency together
with a good quality crystal. A ceramic resonator can be used in place of the crystal in
cost-critical applications. If a ceramic resonator is used, the two capacitors normally
have different values depending on the oscillator frequency. We recommend consulting
the manufacturer of the ceramic resonator for value specifications of these capacitors.
User’s Manual
C = tbd pF + tbd pF for crystal operation
(incl. StrayCapacitance)
6.67-10.67
MHz
Crystal Oscillator Mode
Oscillator and Clock Circuit
shows the recommended oscillator circuit.
Recommended Oscillator Circuit
XTAL2
XTAL1
C868
Reset, Brownout and System Clock Operation
5-10
Signal
External Oscillator
N.C.
Driving from External Source
Figure
5-6). lt is operated in
V 1.0, 2003-01
XTAL2
XTAL1
C868