MC68HC05C5 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MC68HC05C5

SPECIFICATION (General Release)

Freescale Semiconductor 

Freescale SemicondMuCc6t8oHrC,0I5nCc5.Specification Rev. 1.2

NOTE: Negative true signals like RESET and IRQ will be denoted with either an

asterisk or an overline.

1.4 SIGNAL DESCRIPTION

1.4.1 VDD AND VSS

Power is supplied to the microcontroller using these two pins. VDD is the positive supply,

and VSS is ground.

1.4.2 PE

PE is the Program Enable for the EEPROM. This pin has a very weak internal pullup. If

this pin is held at a logic "1" level or left not connected, the EEPROM can be programmed

and erased. If this pin is held at a logic "0" level, EEPROM programming and erasing is

disabled. The pullup will not be able to pull the pin high if any circuit is connected to PE.

1.4.3 IRQ

This pin has a mask option that provides two different choices of interrupt triggering

sensitivity. The IRQ pin contains an internal Schmitt trigger as part of its input to improve

noise immunity. Refer to 4.5 INTERRUPTS for more detail.

1.4.4 OSC1 AND OSC2

These pins provide control input for an on-chip clock oscillator circuit. A crystal, a ceramic

resonator, a resistor/capacitor combination, or an external signal connects to these pins

providing a system clock. A mask option selects either a crystal/ceramic resonator or a

resistor/capacitor as the frequency determining element. The oscillator frequency is two

times the internal bus rate.

1.4.5 RESET

This active low pin is used to reset the MCU to a known start-up state by pulling RESET

low. The RESET pin contains an internal Schmitt trigger as part of its input to improve

noise immunity.

1.4.6 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.

1.4.7 PA0-PA7

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

all port A lines are configured as input during power-on or reset. Refer to 5.5 INPUT/

OUTPUT PROGRAMMING for a detailed description of I/O programming.

Section 1: Introduction

For More Information On This Product,

Go to: www.freescale.com

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