MC68HC05P9ACDW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P9ACDW Datasheet - Page 17

• Manufacturer Part Number: MC68HC05P9ACDW
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

RC Oscillator
External Clock
Connections
RESET
IRQ
9-mc68hc05p9a
MOTOROLA
NOTE:
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.
The lowest cost oscillator is the
RC oscillator configuration
where a resistor is connected
between the two oscillator pins
as shown in
internal startup resistor of
approximately 2 M is not
recommended between OSC1
and OSC2 for the RC-type
oscillator.
An external clock from another
CMOS-compatible device can
drive the OSC1 input, with the
OSC2 pin unconnected, as
Figure 7
A logic 0 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.
The IRQ pin has the following functions:
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
Applying asynchronous external interrupt signals
Applying V
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Go to: www.freescale.com
Figure
TST
Pin Descriptions
6. The
, the mode detection voltage
Figure 6. RC Oscillator
Figure 7. External Clock
CMOS CLOCK
EXTERNAL
OSC1
Connections
Connections
MCU
MCU
R
UNCONNECTED
Pin Descriptions
OSC2
Pin Functions
17