mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 94

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Oscillator (OSC)
7.3 Oscillator External Connections
Technical Data
94
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
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
MCU
Figure 7-1. Oscillator External Connections
1
OSC1
Oscillator (OSC)
(nominally 12MHz)
C1
12 MHz
S
R
X1
) is included in the diagram to follow strict Pierce
B
S
1
(not required for 12MHz)
OSCXCLK
2
B
(can also be a fixed capacitor)
TO CGM
OSC2
R
C2
S
*
Figure
DOUBLER
CLOCK
* R
higher frequency crystals.
Refer to manufacturer’s data.
S
÷ 2
can be 0 (shorted) when used with
7-1. This figure shows only
OSCDCLK
MC68HC908JB16
TO COP, SCI
TO USB
Freescale Semiconductor
÷ 2
OSCOUT
—
Rev. 1.1
TO SIM