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| MC68HC05K0 Datasheet, PDF (26/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit | |||
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Technical Data
Freescale Semiconductor, Inc.
1.6.2.4 3-Pin RC Oscillator
Another low-cost option is the 3-pin RC oscillator configuration shown in
Figure 1-8. The 3-pin oscillator is more stable than the 2-pin oscillator.
The OSC2 and PB1/OSC3 signals are square-type waves, and the
signal on OSC1 is a triangular-type wave. Short the OSC1 pin to the side
of resistor R, which is connected to capacitor C3. The 3-pin RC oscillator
configuration is recommended for frequencies of 1 MHz down to
100 kHz.
MCU
PB1/OSC3
+
R
C3
C3
OSC1
OSC2
VSS
VDD
VSS
R
C1 C2
VDD
Figure 1-8. 3-Pin RC Oscillator Connections
To use the 3-pin RC oscillator configuration, select the 3-pin RC
oscillator mask option when ordering the MCU.
NOTE:
In the 3-pin RC oscillator configuration the PEPROM of the
MC68HC05K1 cannot be programmed by user software. If the voltage
on IRQ/VPP is raised above VDD, the oscillator will revert to a 2-pin
oscillator configuration and device operation will be disrupted.
Technical Data
MC68HC05K0 ⢠MC68HC05K1 â Rev. 2.0
General Description
For More Information On This Product,
Go to: www.freescale.com
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