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

Modes of Operation and Pin Descriptions

Contents

Modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Pin descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Modes of operation

The MC68HC05E6 operates in single chip mode only. The

MC68HC705E6 has two modes of operation; single chip and EPROM

bootloader mode. Table 1 shows the conditions required to enter the

EPROM modes of operation on the rising edge of RESET.

Table 1 MC68HC705E6 operating mode entry conditions

RESET

IRQ/VPP

VSS to

VDD

2VDD

PC4

x

1

1

1

PC3 PC2

Mode

x

x

Single chip

0

1

1

0 EPROM bootloader

1

1

x = don’t care

Verify only

Program 1 byte

Program 4 bytes

Single chip mode

This is the normal operating mode of the MC68HC05E6. In this mode the

device functions as a self-contained microcomputer (MCU) with all

on-board peripherals, including the 8-bit I/O ports (A, B, C and D) and

the 4-bit input-only port (G), available to the user. All address and data

activity occurs within the MCU.

Single chip mode is entered on the rising edge of RESET if the voltage

level on the IRQ pin is within the normal operating range.

1-pin

MC68HC05E6 — Rev. 1.0

Modes of Operation and Pin Descriptions

For More Information On This Product,

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