Introduction

The Motorola MC68HC705JJ7 and MC68HC705JP7 are EPROM versions of the MC68HC05JJ/JP Family of microcontrollers.

Features

? Low-Cost, HC05 Core MCU in 20-Pin Package (MC68HC705JJ7) or 28-Pin Package (MC68HC705JP7)

? 6160 Bytes of User EPROM (Including 16 Bytes of User Vectors)

? 224 Bytes of Low-Power User RAM (4 Transistors)

? 64 Bits of Personality EPROM (Serial Access)

? 16-Bit Programmable Timer with Input Capture and Output Compare

? 15-Stage Core Timer Including 8-Bit Free-Running Counter and 4-Stage Selectable Real-Time Interrupt Generator

? Simple Serial Input/Output Port (SIOP) with Interrupt Capability

? Two Voltage Comparators, One of Which Can be Combined with the 16-Bit Programmable Timer to Create a 4-Channel, SingleSlope A/D Converter

? Output of Voltage Comparator Can Drive Port Pin PB4 Directly Under Software Control

? 14 I/O Lines (MC68HC705JJ7) or 22 I/O Lines (MC68HC705JP7) Including High-Source/Sink Current Capability on 6 I/O Pins (MC68HC705JJ7) or 14 I/O Pins (MC68HC705JP7)

? Programmable 8-Bit Mask Option Register (MOR) to Select Mask Options Found in ROM-Based Versions

? MOR Selectable Software Programmable Pulldowns on All I/O Pins and Keyboard Scan Interrupt on Four I/O Pins

? Software Mask and Request Bit for IRQ Interrupt with MOR Selectable Sensitivity on IRQ Interrupt (Edge- and Level-Sensitive or Edge-Only)

? On-Chip Oscillator with Device Option of Crystal/Ceramic Resonator or RC Operation and MOR Selectable Shunt Resistor, Approximately 2 M?

? Internal Oscillator for Lower-Power Operation, Approximately 100 kHz (500 kHz Selected as Device Option)

? EPROM Security Bit1 to Aid in Locking Out Access to Programmable EPROM array

? MOR Selectable (COP) Watchdog System

? Power-Saving Stop and Wait Mode Instructions (MOR Selectable STOP Conversion to Halt and Option for Fast 16-Cycle Restart, and Power-On Reset)

? On-Chip Temperature Measurement Diode

? MOR Selectable Low-Voltage Inhibit to Reset CPU in Low-Voltage Conditions

? Illegal Address Reset

? Internal Steering Diode and Pullup Device on RESET Pin to VDD