THRSim11 for Windows

Name: THRSim11
Rating: 4.2 (5 reviews)
Author: Harry Broeders

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Editors’ Review

Download.com staffFebruary 26, 2026

THRSim11 is a Windows application for editing, assembling, simulating, and debugging 68HC11 microcontroller programs. It supports both simulation and real hardware debugging.

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Trial version

Pros
- Simulates CPU, ROM, RAM, and memory-mapped I/O.
- Simulates peripherals like timer, ADC, and serial port.
- Graphical interface for real-time register and memory inspection.
- Supports debugging on target EVM/EVB boards.
- C/C++ debugging with DWARF2 format support.
Cons
- Limited to 68HC11 microcontroller family.
- External component simulation options are basic.
- Requires BUFFALO monitor for target board communication.
- No mention of advanced memory management simulation.
- Documentation details not provided in review.

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Full Specifications

GENERAL

Release: April 5, 2013

Latest update: February 26, 2026

Version: 5.30

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 2000
Windows ME
Windows 10
Windows NT
Windows 98
Windows XP

Additional Requirements: None

POPULARITY

Total Downloads: 9,048

Downloads Last Week: 4

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Last Updated

User Reviews

4.2/5

5 User Votes

February 5, 2003
Pros
Cons
Summary
Excellent product, great teaching aid.
October 14, 2002
Pros
Cons
Summary
I have been using THRSim11 for quite a few years now in my university-level microcontroller programming and interfacing classes. It has a wide range of features including a large number of virtual devices that can be operated on-screen as the simulation runs. It can also interact with a 68HC11 target board (e.g. EVB). I use it in my classes both to demo features of the 68HC11 during lecture and as an environment for student testing of assigned programs. Students learn the value of simulation (in a virtual hardware environment) as a tool which complements the use of a hardware test kit like the EVB or EVM. I recommend this product highly, either for classroom use or for self-study.
"Simple Yet Powerful"
October 14, 2002
Pros
Cons
Summary
This simulator is well hand-crafted. It saves a lot of time in hardware by providing realistic modeling. Once simulating is ideal, hardware is on is way! Also, the author is very insightful.
Excellent and a good value
October 13, 2002
Pros
Cons
Summary
I am a student in a microcontroller course. I am running: 1) Windows XP, 2)a Mekatronix MB 2325 Bidirectional Serial Communications Voltage Converter, 3)Mekatronix MSCC11 Microcontroller Board, and 4) a MC68HC11E20 chip with Buffalo Monitor 3.4 installed. I have found this software easy to use and nicely integrated and would recommend it to anyone. Further, the author has been available and prompt in answering my questions about the software.
bahhhhh junk
October 5, 2002
Pros
Cons
Summary
bahhhh junk

Developer’s Description

By Harry Broeders

Edit, assemble, simulate and debug 68HC11 programs.

The Motorola 68HC11 microcontroller was a popular microcontroller used in many applications. With the THRSim11 program you can edit, assemble, simulate and debug programs for the 68HC11 on your windows PC. You can also use THRSim11 to debug the program on your target EVM or EVB compatable board. The simulator simulates the CPU, ROM, RAM, and all memory mapped I/O ports. It also simulates the on board peripherals such as: timer (including pulse accumulator), analog to digital converter, parallel ports (including handshake), serial port, I/O pins (including analog and interrupt pins).While debugging the graphical user interface makes it possible to view and control every register (CPU registers and I/O registers), memory location (data, program, and stack), and pin of the simulated microcontroller. Even when the program is running! It is possible to stop the simulation at any combination of events.A number of (simulated) external components can be connected to the pins of the simulated 68HC11 while debugging. For example: LED's, switches, analog sliders (variable voltage potential), serial transmitter and receiver, and many more...There is also a 4 x 20 LCD character display mapped in the address space of the 68HC11.THRSim11 can communicate with any board running the BUFFALO monitor program. When your assembly program is loaded into the target board the graphical user interface makes it possible to view and control every register (CPU registers and I/O registers) and memory location (data, program, and stack) of the real microcontroller. It is possible to stop the execution at any address and inspect or change the registers and memory location (data, program, and stack) of the real microcontroller.For high level language (C/C++) support THRSim11 has a debugger that reads object files with debug info in the DWARF2 debug format used by the free GNU gcc compiler. C variables are also updated while running the program.

THRSim11 for Windows

Editors’ Review

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Pros

Cons