MC68HC05EV View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC68HC05EV

HCMOS Microcontroller Unit

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Modes of Operation and Pin Descriptions

Pin descriptions

PC0ÐPC7

These eight port pins comprise port C. The state of any pin is software

programmable, and all the pins can be configured as inputs with pull-up

resistors or open-drain outputs using the data direction register and

configuration register. During power-on or reset, all port C registers are

cleared, thereby returning the port pins to normal inputs with pull-up

resistors. In addition to their normal I/O functions, PC0 is shared with the

input capture function (TCAP) of the programmable timer and PC1 with

the output compare function (TCMP); see Port C. PC0–PC7 are used to

provide a keyboard interrupt facility when configured as inputs and not

used for timer functions. They contain an internal Schmitt trigger as part

of their input to improve noise immunity.

NOTE: PC6 and PC7 are not available in the 28-pin package.

PD0ÐPD7

These eight port pins comprise port D. The state of any pin is software

programmable, and all the pins can be configured as inputs with pull-up

resistors or open-drain outputs using the configuration register. During

power-on or reset, all port D registers are cleared, thereby returning the

port pins to normal inputs with pull-up resistors.

NOTE: PD0–PD7 are not bonded out in the 28-pin package.

PG0ÐPG3

These four input-only port pins comprise port G. In addition to their

normal input functions, the pins are shared with the A/D converter

subsystem where they are used as the digital input pins AD0–AD3 (see

A-to-D Converter).

NOTE: PG1–PG3 are not bonded out in the 28-pin package; the A/D converter

has only one input channel.

VREFH

This pin provides the high voltage reference for the A/D converter. The

low voltage reference (VREFL) is tied to VSS internally.

9-pin

MC68HC05E6 — Rev. 1.0

Modes of Operation and Pin Descriptions

For More Information On This Product,

Go to: www.freescale.com

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