MC68HC705C Motorola, MC68HC705C Datasheet - Page 27

• Manufacturer Part Number: MC68HC705C
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

1.7 Pin Functions
1.7.1 V
1.7.2 OSC1 and OSC2
MC68HC705C8A — Rev. 2.0
MOTOROLA
DD
and V
NOTE:
SS
This subsection describes the MC68HC705C8A signals. Reference is
made, where applicable, to other sections that contain more detail about
the function being performed.
V
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
The OSC1 and OSC2 pins are the control connections for the 2-pin
on-chip oscillator. The oscillator can be driven by:
The frequency of the internal oscillator is f
internal oscillator output by two to produce the internal clock with a
frequency of f
DD
•
•
•
and V
Crystal resonator
Ceramic resonator
External clock signal
1-7.
SS
are the power supply and ground pins. The MCU operates
OP
General Description
.
Figure 1-7. Bypassing Layout
OSC
Recommendation
MCU
. The MCU divides the
V
V
DD
SS
C1
General Description
V+
+
Technical Data
C2
Pin Functions
27