MC68HC705P9CS datasheet(28/160 Pages) FREESCALE

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Pin Descriptions

Technical Data

MC68HC705P9 — Rev. 4.0

Pin Descriptions

MOTOROLA

2.3.2.2 Ceramic Resonator Connections

To reduce cost, use a ceramic

resonator in place of the crystal.

Figure 2-4 shows a ceramic

resonator circuit. For the values

of any external components,

follow the recommendations of

the resonator manufacturer. The

load capacitance values used in

the oscillator circuit design

should include all stray layout

capacitances. To minimize

output distortion, mount the

resonator and capacitors as

close as possible to the pins.

NOTE:

Because the frequency stability of ceramic resonators is not as high as

that of crystal oscillators, using a ceramic resonator may degrade the

performance of the ADC.

2.3.2.3 External Clock Connections

An external clock from another

CMOS-compatible device can

drive the OSC1 input, with the

OSC2 pin unconnected, as

Figure 2-5 shows.

2.3.3 RESET

A logic zero on the RESET pin

forces the MCU to a known

startup state. The RESET pin

input circuit contains an internal

Schmitt trigger to improve noise

immunity.

MCU

CERAMIC

RESONATOR

Figure 2-4. Ceramic Resonator

Connections

MCU

EXTERNAL

CMOS CLOCK

UNCONNECTED

Figure 2-5. External Clock

Connections

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

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