MC68HC908JK3 MOTOROLA [Motorola, Inc], MC68HC908JK3 Datasheet - Page 96

• Manufacturer Part Number: MC68HC908JK3
• Description: MC68HC908JK1
• Manufacturer: MOTOROLA [Motorola, Inc]

Oscillator (OSC)
8.3 X-tal Oscillator (MC68HC908xxx)
Technical Data
96
The X-tal oscillator circuit is designed for use with an external crystal or
ceramic resonator to provide accurate clock source.
In its typical configuration, the X-tal oscillator is 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:
From SIM
•
•
•
•
•
MCU
SIMOSCEN
Crystal, X
Fixed capacitor, C
Tuning capacitor, C
Feedback resistor, R
Series resistor, R
Figure 8-1. X-tal Oscillator External Connections
OSC1
1
C
Oscillator (OSC)
1
R
X
B
1
S
1
(optional)
2
XTALCLK
B
(can also be a fixed capacitor)
2OSCOUT
OSC2
R
C
S
*
2
*R
See
Refer to manufacturer’s data.
S
To SIM
can be zero (shorted) when used with higher-frequency crystals.
Section 18.
Figure
÷ 2
OSCOUT
for component value requirements.
8-1. This figure shows only
MC68H(R)C908JL3
To SIM
MOTOROLA
—
Rev. 1.0