HC705P6AGRSSLASHD datasheet(20/134 Pages) NXP

20 / 134 page

General Description

General Release Specification

MC68HC705P6A — Rev. 1.0

General Description

Figure 1-2. Oscillator Connections

1.4.2.1 Crystal

The circuit in Figure 1-2(a) shows a typical oscillator circuit for an AT-

cut, parallel resonant crystal. Follow the crystal manufacturer’s

recommendations, as the crystal parameters determine the external

component values required to provide maximum stability and reliable

startup. The load capacitance values used in the oscillator circuit design

should include all stray capacitances. Mount the crystal and components

as close as possible to the pins for startup stabilization and to minimize

output distortion.

1.4.2.2 Ceramic Resonator

In cost-sensitive applications, use a ceramic resonator in place of a

crystal. Use the circuit in Figure 1-2(a) for a ceramic resonator and

follow the resonator manufacturer’s recommendations, as the resonator

parameters determine the external component values required for

maximum stability and reliable starting. The load capacitance values

used in the oscillator circuit design should include all stray capacitances.

Mount the resonator and components as close as possible to the pins for

startup stabilization and to minimize output distortion.

To VDD (or STOP)

(a)

Crystal or Ceramic

Resonator Connections

(b)

External Clock Source

Connections

OSC1

OSC2

MCU

37 pF

4.7 M

Ω

MCU

OSC1

OSC2

UNCONNECTED

EXTERNAL CLOCK

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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