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Introduction

The MC68HC05K1 and MC68HC05K0 are members of Motorola’s low-cost, high-performance M68HC05 Family of 8-bit microcontroller units (MCU). The M68HC05 Family is based on the customer-specified integrated circuit (CSIC) design strategy. All MCUs in the family use the popular M68HC05 central processor unit (CPU) and are available with a variety of subsystems, memory sizes and types, and package types.

On-chip memory includes 504 bytes of user read-only memory (ROM) and 32 bytes of user random-access memory (RAM).

The MC68HC05K1 has an additional 64-bit personality, erasable, programmable, read-only memory (PEPROM). In an MC68HC05K1

MCU, the PEPROM cannot be erased and serves as a 64-bit array of one-time programmable ROM (OTPROM).

Appendix A. MC68HCL05K0 introduces the MC68HCL05K0, a low-power version of the MC68HC05K0.

Appendix B. MC68HSC05K0 introduces the MC68HSC05K0, a high-speed version of the MC68HC05K0.

Features

Features of the MC68HC05K0 and MC68HC05K1 include:

? M68HC05 CPU

? Memory-mapped input/output (I/O) registers

? 504 bytes of ROM including eight user vector locations

? 32 bytes of user RAM

? 64-bit PEPROM/OTPROM (MC68HC05K1 only)

? 10 bidirectional input/output (I/O) pins with these features:

– Software programmable pulldown devices

– Four I/O pins with 8-mA current sinking capability

– Four I/O pins with maskable external interrupt capability

? Hardware mask and flag for external interrupts

? Fully static operation with no minimum clock speed

? On-chip oscillator with connections for a crystal/ceramic resonator or for a mask-optional 2-pin or 3-pin resistor-capacitor (RC) oscillator

? Computer operating properly (COP) watchdog

? 15-bit multifunction timer with real-time interrupt circuit

? Power-saving stop, wait/halt, and data-retention modes

? 8 × 8 unsigned multiply instruction

? Illegal address reset

? Low-voltage reset

? 16-pin plastic dual in-line package (PDIP)

? 16-pin small outline integrated circuit package (SOIC)