MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 28

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Pin Descriptions
2.3.2.2 Ceramic Resonator Connections
2.3.2.3 External Clock Connections
2.3.3 RESET
Technical Data
28
NOTE:
To reduce cost, use a ceramic
resonator in place of the crystal.
Figure 2-4
resonator circuit. For the values
of any external components,
follow the recommendations of
the resonator manufacturer. The
load capacitance values used in
the oscillator circuit design
should include all stray layout
capacitances. To minimize
output distortion, mount the
resonator and capacitors as
close as possible to the pins.
Because the frequency stability of ceramic resonators is not as high as
that of crystal oscillators, using a ceramic resonator may degrade the
performance of the ADC.
An external clock from another
CMOS-compatible device can
drive the OSC1 input, with the
OSC2 pin unconnected, as
Figure 2-5
A logic zero on the RESET pin
forces the MCU to a known
startup state. The RESET pin
input circuit contains an internal
Schmitt trigger to improve noise
immunity.
Freescale Semiconductor, Inc.
For More Information On This Product,
shows a ceramic
shows.
Go to: www.freescale.com
Pin Descriptions
Figure 2-4. Ceramic Resonator
Figure 2-5. External Clock
CMOS CLOCK
EXTERNAL
Connections
Connections
MC68HC705P9 — Rev. 4.0
RESONATOR
CERAMIC
MCU
MCU
UNCONNECTED
MOTOROLA