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| MC68HC908JK1 Datasheet, PDF (96/210 Pages) Motorola, Inc – MC68HC908JK1 | |||
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Oscillator (OSC)
8.3 X-tal Oscillator (MC68HC908xxx)
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 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)
From SIM
To SIM
2OSCOUT
To SIM
OSCOUT
SIMOSCEN
MCU
OSC1
XTALCLK
÷2
OSC2
RB
X1
C1
RS*
*RS can be zero (shorted) when used with higher-frequency crystals.
Refer to manufacturerâs data.
See Section 18. for component value requirements.
C2
Figure 8-1. X-tal Oscillator External Connections
Technical Data
96
Oscillator (OSC)
MC68H(R)C908JL3 â Rev. 1.0
MOTOROLA
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