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GENERAL DESCRIPTION

The MC68HC05J5A is a member of the low-cost high-performance M68HC05

Family of 8-bit microcontroller units (MCUs). The M68HC05 Family is based on

the customer-specified integrated circuit design strategy. All MCUs in the family

use the popular M68HC05 central processing unit (CPU) and are available with a

variety of subsystems, memory sizes and types, and package types.

The MC68HC05J5A is an enhanced version of the MC68HC05J5, with expanded

RAM, ROM sizes, and an additional 16-bit timer with TCAP. This MCU is available

in 20-pin PDIP, 20-pin SOIC, 16-pin PDIP, and 16-pin SOIC packages. The 16-pin

version has four less I/O lines.

Three variation on the MC68HC05J5A device are available; a summary of their

differences are listed in the following table:

FEATURES

The features of the MC68HC05J5A include the following:

? Industry standard M68HC05 CPU core

? Fully static operation with no minimum clock speed

? Power-saving STOP and WAIT modes

? Memory-Mapped Input/Output (I/O) registers

? 2560 Bytes of user ROM with security feature

? 128 Bytes of user RAM

? On-Chip Oscillator:

– Crystal/Resonator oscillator

– External clock oscillator

? 15-Bit Multi-function Timer

? 16-Bit Programmable Timer with Input Capture

? 14 Bidirectional I/O pins (10 I/O pins on 16-pin package)

– PA0-PA5, PB0, and PB3-PB5: with software programmable input pulldown

devices

– PB1, PB2, PA6 and PA7: open-drained I/O pins with software

programmable pull-up devices

– PA6, PA7, and PB1: with slow output falling transition feature

– PA7: with falling-edge interrupt capability

– PA0-PA3: with maskable rising-edge only or rising-edge and high

level interrupt capability

– 20-pin package: PB1 and PB2, each with 25mA current sink

capability

– 16-pin package: PB1 with 50mA current sink capability

? Computer Operation Properly (COP) Watchdog

? Low Voltage Reset Circuit

? Illegal Address Reset

? 20-pin PDIP, 20-pin SOIC, 16-pin PDIP, and 16-pin SOIC packages