mc68hc05p9a Freescale Semiconductor, Inc, mc68hc05p9a Datasheet - Page 15

• Manufacturer Part Number: mc68hc05p9a
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

Pin Functions
V
OSC1 and OSC2
7-mc68hc05p9a
MOTOROLA
DD
and V
SS
V
from a single 5-V 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 as
Figure 3
bypass capacitors as close as
possible to the MCU. C2 is an
optional bulk current bypass
capacitor for use in applications
that require the port pins to
source high current levels.
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of the following:
The frequency of the on-chip oscillator is f
internal oscillator output by two to produce the internal clock with a
frequency of f
DD
•
•
•
•
Freescale Semiconductor, Inc.
and V
For More Information On This Product,
Crystal
Ceramic resonator
RC Oscillator
External clock signal
shows. Place the
SS
Go to: www.freescale.com
are the power supply and ground pins. The MCU operates
OP
.
Pin Descriptions
OSC
Figure 3. Bypassing
V
Recommendation
DD
. The MCU divides the
0.1 F
+
MCU
C1
C2
Pin Descriptions
Pin Functions
15