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| MC68HC908QY4A_10 Datasheet, PDF (97/200 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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Functional Description
The oscillator configuration uses five components:
⢠Crystal, X1
⢠Fixed capacitor, C1
⢠Tuning capacitor, C2 (can also be a fixed capacitor)
⢠Feedback resistor, RB
⢠Series resistor, RS (optional)
NOTE
The series resistor (RS) is included in the diagram to follow strict Pierce
oscillator guidelines and may not be required for all ranges of operation,
especially with high frequency crystals. Refer to the oscillator
characteristics table in the Electricals section for more information.
SIMOSCEN (INTERNAL SIGNAL) OR
OSCENINSTOP (BIT LOCATED IN
CONFIGURATION REGISTER)
BUSCLKX4
BUSCLKX2
XTALCLK
÷2
MCU
OSC1
OSC2
RS
RB
X1
C1
C2
See the electrical section for details.
Figure 11-2. XTAL Oscillator External Connections
MC68HC908QYA/QTA Family Data Sheet, Rev. 3
Freescale Semiconductor
97
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