mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 112

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Oscillator (OSC)
8.3 Oscillator External Connections
Data Sheet
112
In its typical configuration, the oscillator requires five external
components. The crystal oscillator is normally 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:
The series resistor (R
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.
•
•
•
•
•
From
SIM
SIMOSCEN
MCU
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
Figure 8-1. Oscillator External Connections
1
OSC1
Oscillator (OSC)
C
1
S
R
X
) is included in the diagram to follow strict Pierce
B
1
S
1
(optional)
2
B
OSCXCLK
(can also be a fixed capacitor)
OSC2
R
C
S
2
*
To SIM
Figure
*R
8-1. This figure shows only
higher-frequency crystals.
Refer to manufacturer’s data.
S
can be zero (shorted) when used with
MC68HC908BD48
Freescale Semiconductor
÷ 2
OSCOUT
—
To SIM
Rev. 2.1