mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 107

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

7.6 X-tal Oscillator
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
The X-tal oscillator circuit is designed for use with an external crystal or
ceramic resonator to provide an accurate clock source.
In its typical configuration, the X-tal oscillator is connected in a Pierce
oscillator configuration, as shown in
the logical representation of the internal components and may not
represent actual circuitry. The oscillator configuration uses five
components:
See
•
•
•
•
•
STOP_RCLKEN
MCU
Section 24.
CONFIG2
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
for component value requirements.
From SIM
1
Oscillator (OSC)
SIMOSCEN
Figure 7-5. RC Oscillator
S
1
(optional)
2
B
(can also be a fixed capacitor)
V
DD
To Clock Selection MUX
EN
RCCLK
RC OSCILLATOR
R
OSC1
Figure
EXT
7-6. This figure shows only
C
EXT
BUS CLOCK
Oscillator (OSC)
From SIM
X-tal Oscillator
Data Sheet
OSC2
107