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GENERAL DESCRIPTION

The MC68HC05P4A is a 28-pin device based on the MC68HC05P4. The memory

map includes 4160 bytes of user ROM and 176 bytes of RAM. The MCU has two

8-bit input/output (I/O) ports, A and C. Port B has three I/O pins and port D has

two pins, one that is I/O and the other input only. The MC68HC05P4A includes a

simple serial I/O peripheral (SIOP) and an on-chip mask programmable computer

operating properly (COP) watchdog circuit.

Features

? Low Cost

? HC05 Core

? 28-Pin Package

? On-Chip Oscillator with RC or Crystal/Ceramic Resonator Mask Options

? 4160 Bytes of User ROM Including 16 User Vector Locations

? ROM Security Feature

? 176 Bytes of On-Chip RAM

? 16-Bit Timer

? Edge-Sensitive or Edge- and Level-Sensitive Interrupt Trigger Mask

Option

? Simple Serial Input/Output Port

? Mask Option Selectable Watchdog Timer (COP)