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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).