Features

• Low cost

• HC05 Core

• 28-pin package

• On-Chip Oscillator (Crystal or Ceramic Resonator)

• Phase-Locked Loop (PLL) Synthesizer with Programmable Speed

• 4112 Bytes of User ROM (including 16 Bytes of User Vectors)

• 368 Bytes of On-Chip RAM

• 15-Stage Multi-functional Timer with Programmable Input

• Real Time Interrupt Circuit

• COP Watchdog Timer Mask Option

• Custom Periodic Interrupt Circuit

• 20 Bidirectional I/O Lines

• Single-Chip Mode

• Self-Check Mode

• Power Saving STOP and WAIT Modes

• Edge-Sensitive or Edge- and Level-Sensitive Interrupt Trigger

Mask Option

• STOP Instruction Disable Mask Option

• Illegal Address Reset

General Description

There are four mask options on the MC68HC05E1: STOP instruction

(enable/disable), IRQ (Edge-sensitive only or Edge- and level-sensitive),

COP Watchdog Timer (enable/disable), and CPI Rate (1 second, 0.5

second, or 0.25 second).