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Introduction

The MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller. It is a low-cost combination of an M68HC05 Family microprocessor with a 4-channel, 8-bit analog-to-digital (A/D) converter, a 16-bit timer with output compare and input capture, a serial communications port (SIOP), and a computer operating properly (COP) watchdog timer. The M68HC05 CPU core contains 176 bytes of RAM, 4672 bytes of user EPROM, 239 bytes of bootloader ROM, and 21 input/output (I/O) pins (20 bidirectional, 1 input-only). This device is available in either a 28-pin plastic dual in-line (PDIP) or a 28-pin small outline integrated circuit (SOIC) package.

Features

Features of the MC68HC705P6A include:

? Low cost

? M68HC05 core

? 28-pin SOIC, PDIP, or windowed DIP package

? 4672 bytes of user EPROM (including 48 bytes of page zero EPROM and 16 bytes of user vectors)

? 239 bytes of bootloader ROM

? 176 bytes of on-chip RAM

? 4-channel 8-bit A/D converter

? SIOP serial communications port

? 16-bit timer with output compare and input capture

? 20 bidirectional I/O lines and 1 input-only line

? PC0 and PC1 high-current outputs

? Single-chip, bootloader, and test modes

? Power-saving stop, halt, and wait modes

? Static EPROM mask option register (MOR) selectable options:

– COP watchdog timer enable or disable

– Edge-sensitive or edge- and level-sensitive external interrupt

– SIOP most significant bit (MSB) or least significant bit (LSB) first

– SIOP clock rates: OSC divided by 8, 16, 32, or 64

– Stop instruction mode, STOP or HALT

– EPROM security external lockout

– Programmable keyscan (pullups/interrupts) on PA0–PA7