MC68HC705C View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
MFG CO.
'MC68HC705C' PDF : 210 Pages View PDF
General Description
Pin Functions
1.7 Pin Functions
The following paragraphs describe the MC68HC705C4A signals.
1.7.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates
from a single power supply.
Very fast signal transitions occur on the MCU pins, placing high
short-duration current demands on the power supply. To prevent noise
problems, take special care to provide good power supply bypassing at
the MCU. Place bypass capacitors as close to the MCU as possible, as
shown in Figure 1-7.
V+
VDD
+
MCU
C1
C2
VSS
Figure 1-7. Bypassing Layout Recommendation
1.7.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the control connections for the 2-pin
on-chip oscillator. The oscillator can be driven by:
• Crystal resonator
• Ceramic resonator
• External clock signal
NOTE:
The frequency of the internal oscillator is fOSC. The MCU divides the
internal oscillator output by two to produce the internal clock with a
frequency of fOP.
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
MOTOROLA
General Description
Technical Data
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