mc68hc705k1 Freescale Semiconductor, Inc, mc68hc705k1 Datasheet - Page 22

• Manufacturer Part Number: mc68hc705k1
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.6.2.3 2-Pin RC Oscillator
Technical Data
To use the resonator-driven oscillator, the RC bit in the mask option
register must be clear. See
bit connects an internal 2-M startup resistor between OSC1 and
OSC2.
For maximum cost reduction, use the 2-pin RC oscillator configuration
shown in
on OSC1 is a triangular wave. The optimum frequency for the 2-pin
oscillator configuration is 2 MHz.
To use the 2-pin RC oscillator configuration, the RC bit in the mask
option register must be programmed to a logic 1. Setting the RC bit
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 1-6. 3-Pin Ceramic Resonator Connections
Figure
C3
Figure 1-7. 2-Pin RC Oscillator Connections
Go to: www.freescale.com
RESONATOR
CERAMIC
2 M
MCU
General Description
MCU
R
1-7. The OSC2 signal is a square wave, and the signal
9.6 Mask Option
Register. Clearing the RC
MC68HC705K1 — Rev. 2.0
OSC1
OSC2
V
V
OSC1
OSC2
DD
SS
V
V
DD
SS
C1 C2
R
C1 C2
C3
CER.
RES.
V
SS
V
SS