MC68HC908AP16CFB datasheet(96/440 Pages) MOTOROLA

96 / 440 page

Oscillator (OSC)

Data Sheet

MC68HC908AP Family — Rev. 2.5

MOTOROLA

Figure 7-5. RC Oscillator

7.5 X-tal Oscillator

The crystal (x-tal) oscillator circuit is designed for use with an external

32.768kHz crystal to provide an accurate clock source.

In its typical configuration, the x-tal oscillator is connected in a Pierce

oscillator configuration, as shown in Figure 7-6. 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 (32.768kHz)

•

Fixed capacitor, C1

•

Tuning capacitor, C2 (can also be a fixed capacitor)

•

Feedback resistor, R

•

Series resistor, R

S (optional)

REXT

CEXT

VREG

MCU

OSC1

SIMOSCEN

From SIM

STOP_RCLKEN

CONFIG2

RC OSCILLATOR

See Section 24. for component value requirements.

BUS CLOCK

From SIM

OSC2

RCCLK

To Clock Selection MUX

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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