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)