MC68HC705C9ACFN datasheet(30/157 Pages) FREESCALE

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General Release Speciﬁcation

Functional Pin Descriptions

MC68HC705C9A — Rev. 2.0

General Description

trigger as part of its input to improve noise immunity. Refer to Section 4.

Interrupts for more detail.

1.7.4 OSC1 andOSC2

These pins provide control input for an on-chip clock oscillator circuit. A

crystal connected to these pins provides a system clock. The internal

frequency is one-half the crystal frequency.

1.7.5 RESET

As an input pin, this active low RESET pin is used to reset the MCU to a

known startup state by pulling RESET low. As an output pin, when in

MC68HC05C9A mode only, the RESET pin indicates that an internal

MCU reset has occurred. The RESET pin contains an internal Schmitt

trigger as part of its input to improve noise immunity. Refer to Section 5.

Resets for more detail.

1.7.6 TCAP

This pin controls the input capture feature for the on-chip programmable

timer. The TCAP pin contains an internal Schmitt trigger as part of its

input to improve noise immunity. Refer to Section 8. Capture/Compare

Timer for more detail.

1.7.7 TCMP

The TCMP pin provides an output for the output compare feature of the

on-chip programmable timer. Refer to Section 8. Capture/Compare

Timer for more detail.

1.7.8 PA0–PA7

These eight I/O lines comprise port A. The state of each pin is software

programmable and all port A pins are configured as inputs during reset.

Refer to Section 7. Input/Output Ports for more detail.

Freescale Semiconductor, Inc.

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MC68HC705C9ACFN Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc