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M68HC08 Datasheet(PDF) 112 Page - Freescale Semiconductor, Inc

Part # M68HC08
Description  Microcontrollers
PDF  288 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 112 Page - Freescale Semiconductor, Inc

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Oscillator (OSC)
Data Sheet
MC68HC908BD48 — Rev. 2.1
112
Oscillator (OSC)
Freescale Semiconductor
8.3 Oscillator External Connections
In its typical configuration, the oscillator requires five external
components. The crystal oscillator is normally connected in a Pierce
oscillator configuration, as shown in Figure 8-1. This figure shows only
the logical representation of the internal components and may not
represent actual circuitry. 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)
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 crystal
manufacturer’s data for more information.
Figure 8-1. Oscillator External Connections
C1
C2
SIMOSCEN
OSCXCLK
RB
X1
RS*
*RS can be zero (shorted) when used with
MCU
From
SIM
÷ 2
OSCOUT
To SIM
To SIM
OSC1
OSC2
higher-frequency crystals.
Refer to manufacturer’s data.



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