DF6811 – High-Performance 68HC11-Compatible 8-bit MCU IP Core

Modern Replacement for Motorola 68HC11 Microcontrollers

The DF6811 is an advanced 8-bit MCU IP Core, fully binary-compatible with the industry-standard Motorola 68HC11 microcontroller family. Designed as a drop-in replacement for legacy 68HC11 devices, the DF6811 delivers significantly higher performance, lower power consumption, and seamless integration into modern FPGA and ASIC SoC designs.

At its core, DF6811 features an improved FAST architecture, delivering up to 4× higher performance compared to original 68HC11 implementations—without requiring any changes to existing software.

FAST Architecture – Up to 4× Performance Boost

The DF6811 implements a highly optimized FAST CPU architecture that dramatically increases instruction throughput while maintaining cycle-accurate compatibility with original 68HC11 software.

This makes the DF6811 ideal for:

• Performance-constrained legacy systems

• Real-time automotive and industrial control

• Designs requiring higher speed at lower clock frequencies

Fully Compatible 68HC11 Configurations

The DF6811 can be delivered in configurations matching the most popular 68HC11 variants:

• 68HC11A

• 68HC11D

• 68HC11E

This ensures software reuse, simplified migration, and reduced verification effort when replacing discontinued or hard-to-source MCUs.

Rich On-Chip Peripheral Set

In its standard configuration, DF6811 integrates the key peripherals expected from a classic 68HC11 microcontroller:

Communication Interfaces

• Asynchronous SCI (Serial Communications Interface)

• Synchronous SPI (Serial Peripheral Interface)

Advanced Timer System

• 16-bit free-running timer

• 3 input capture channels

• 5 output compare channels

• Real-Time Interrupt (RTI) function

Pulse Accumulator

• 8-bit pulse accumulator

• Event counting and period measurement

Built-In Safety and Reliability Features

The DF6811 includes multiple self-monitoring and protection mechanisms:

• COP Watchdog Timer – protects against software lockups

• Illegal Opcode Detection – triggers a non-maskable interrupt

• On-chip self-monitoring circuitry for system error detection

These features make DF6811 especially suitable for automotive, industrial, and mission-critical embedded systems.

Low-Power Operation for Battery-Driven Designs

To reduce power consumption, the DF6811 supports two classic 68HC11-compatible low-power modes:

• WAIT mode

• STOP mode

These modes significantly lower power usage, making the DF6811 ideal for battery-powered, portable, and automotive electronics.

ADC Compatibility for 68HC11E Applications

The DF6811E variant can be equipped with an ADC Controller, allowing the use of external ADC devices while maintaining standard 68HC11E ADC software compatibility.

The external ADC is presented to the software as if it were an internal ADC—ensuring zero firmware changes.

Fully Customizable – Pay Only for What You Use

The DF6811 is fully configurable at synthesis time:

• Enable or disable peripherals

• Match exact legacy MCU configurations

• Optimize for area, power, or performance

This eliminates unnecessary logic, reduces silicon cost, and ensures an exact-fit MCU implementation for your SoC.

Professional, Non-Intrusive Debugging with DoCD™

Like all DCD MCU IP cores, the DF6811 includes DoCD™ – DCD’s proprietary Hardware Debug System.

With DoCD™, engineers can:

• Halt, run, and single-step code in real time

• Inspect and modify registers and SFRs

• Access program and data memory

• Debug user-defined peripherals

• Perform non-intrusive debugging of a running system

Unlike traditional on-chip debuggers, DoCD™ does not disturb real-time execution, making it ideal for safety- and timing-critical designs.

Verification-Ready and Technology Independent

The DF6811 IP core is:

• Technology independent (FPGA & ASIC ready)

• Delivered with a fully automated testbench

• Supplied with a complete regression test suite

This ensures fast validation, low integration risk, and smooth adoption into existing SoC design flows.

Why Choose DF6811?

✔ 100% binary compatibility with Motorola 68HC11
✔ Up to 4× faster than original implementations
✔ Integrated timers, serial interfaces, and safety features
✔ Ultra-low power modes (WAIT / STOP)
✔ Fully customizable configuration
✔ Non-intrusive professional debugging (DoCD™)
✔ Ideal for FPGA and ASIC-based legacy MCU replacement

DF6811 vs Original 68HC11 – Technical Comparison Table

DF6811 vs Motorola 68HC11 MCU

Key takeaway:

DF6811 delivers higher performance, lower power, and guaranteed availability—while preserving full 68HC11 software compatibility.

68HC11 End-of-Life Migration Landing Page (SEO Content)

68HC11 End-of-Life? Migrate Safely with DF6811

A Drop-In, Software-Compatible Replacement for Legacy 68HC11 Designs

Many automotive, industrial, and embedded systems still rely on Motorola 68HC11 microcontrollers, now long obsolete or end-of-life. Redesigning such systems around a completely new architecture is risky, costly, and time-consuming.

DF6811 by DCD-SEMI solves this problem.

Why Migrating from 68HC11 Is Hard

• Legacy firmware written and validated over decades

• Certification constraints (automotive, industrial)

• Tight real-time timing dependencies

• Peripheral behavior expectations

• Risk of introducing software regressions

Why DF6811 Is the Safest Migration Path

✅ 100% binary compatibility with 68HC11
✅ No firmware rewrite required
✅ Same registers, instructions, and peripherals
✅ Higher performance at lower clock speeds
✅ FPGA and ASIC-ready
✅ Long-term availability

DF6811 allows you to preserve your software investment while modernizing the hardware platform.

Ideal Migration Scenarios

• Automotive ECUs

• Industrial controllers

• Power electronics

• Medical and measurement equipment

• Defense and long-lifecycle embedded products

Modernize Without Rewriting Software

Unlike ARM Cortex-M or RISC-V migrations, DF6811 requires no compiler changes, no retesting of firmware logic, and no timing requalification.

Same code. Better silicon. Zero surprises.

DF6811 vs ARM Cortex-M vs RISC-V – Engineering Selection Guide

Which Architecture Is Right for Legacy MCU Replacement?

DF6811 vs ARM Cortex-M vs RISC-V

When DF6811 Is the Best Choice

Choose DF6811 if:

• You must preserve existing 68HC11 firmware

• You want minimal risk and fast deployment

• You need deterministic real-time behavior

• You want long-term availability without redesign

When ARM or RISC-V Makes Sense

ARM Cortex-M or RISC-V are great for greenfield designs, but not for legacy MCU replacement where software reuse and timing predictability are critical.

Final Recommendation

DF6811 is the fastest, safest, and lowest-risk path to modernize legacy 68HC11 systems—without rewriting a single line of code.

ALL DCD’S IP CORES ARE TECHNOLOGY AGNOSTIC, ENSURING 100% COMPATIBILITY WITH ALL FPGA AND ASIC VENDORS.

For further details, email info@dcd-semi.com

• FAST architecture, 4 times faster than the original implementation
• Software compatible with industry standard 68HC11
• 10 times faster multiplication
• 16 times faster division
• 256 bytes of remapped System Function Registers space (SFRs)
• De-multiplexed Address/Data Bus for easy memory connection
• The core can also be used without I/O wrapper, so each peripheral functions pins will be separated from I/O ports lines.
• Two power saving modes: STOP, WAIT
• Ready pin allows the Core to operate with slow program and data memories.
• Fully synthesizable
• Static synchronous design
• No internal reset generator or gated clock
• Positive edge clocking and no internal tri-states
• Scan test ready
• 1 GHz of virtual clock frequency compared to the original implementation
• USB, Ethernet, I2C, SPI, UART, CAN, LIN, HDLC, Smart Card interfaces available