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M68HC08 Datasheet(PDF) 94 Page - Freescale Semiconductor, Inc

Part # M68HC08
Description  MC68HC908JB16 Technical Data
PDF  332 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 94 Page - Freescale Semiconductor, Inc

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Oscillator (OSC)
Technical Data
MC68HC908JB16 — Rev. 1.1
94
Oscillator (OSC)
Freescale Semiconductor
7.3 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 7-1. 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 (nominally 12MHz)
•
Fixed capacitor, C1
•
Tuning capacitor, C2 (can also be a fixed capacitor)
•
Feedback resistor, R
B
•
Series resistor, R
S (not required for 12 MHz)
Figure 7-1. Oscillator External Connections
The series resistor (R
S) 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.
C1
C2
SIMOSCEN
OSCDCLK
X1
RS*
* RS can be 0 (shorted) when used with
MCU
FROM SIM
OSCOUT
TO CGM
TO SIM
CLOCK
DOUBLER
÷2
TO COP, SCI
OSC1
OSC2
RB
12 MHz
higher frequency crystals.
Refer to manufacturer’s data.
OSCXCLK
÷2
TO USB



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