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Software simulator for microcontrollers
μCsim can be used to simulate microcontrollers. It supports
MCS51 family, AVR core, Z80, HC08, ST7, STM8, TLCS90, XA51 and Padauk. It can
run on Linux, Windows, OSX, BSD, and other systems.
See what's new in current version.
There are two places where you can download μCsim from:
UNIX version is distributed in source.
- SDCC homepage. μCsim is part of the SDCC (Small Device C
Compiler) project. You can download source of SDCC and precompiled
binaries from http://sdcc.sf.net.
- μCsim site. Standalone source package is available on the μCsim
- Get archive file, uncompress and untar it. These steps will produce a
directory ucsim-X.Y.Z where X.Y.Z is the version number.
- Make sure, that following packages are installed on your system: make,
bison (or yacc), flex (or lex), libncurses-dev.
You will need a C and a C++ compiler as well.
- Go to the directory and configure the package. Issue configure
command. It will determine your system and produce Makefile.
Installation directory can be specified with --prefix=dir
option to the configure. Default directory is /usr/local.
Executable file will be placed in bin subdirectory.
- Compile the package with make command.
- Install executables s51, savr, shc08, sxa,
sz80, etc. to any directory you want. It can be done with make
install command which will place files in installation
directory specified with --prefix=dir option of configure. Note that you may have to have
special privilege to do this if installation directory is not writable
Features of the simulator
- Code analyzer.
The simulator tries to figure out places of valid instructions in code
- Processor types.
The simulator can simulate different type of microcontrollers.
- Multiple consoles.
The simulator can handle more than one command consoles and accepts
command from multiple sources. It also can be driven by other programs
such as debugger interfaces.
- Serial interfaces.
The simulator can virtually connect a terminal to serial interface of
the simulated CPU.
- Memory simulation.
Simulated CPU provides address spaces, storage is simulated by memory
chips, address decoders connects them together.
- Simulator interface.
This is a special interface which provides services for the simulated
program. This services can be used to control the simulator (for example
run/stop) and access some host features (print, file I/O).
- VCD file I/O.
This is a special virtual hardware peripheral which can monitor changes
of a memory location (or a bit in MCS51 where bit address space is
available) and write out changes to a VCD file. It can also be used to
replay events from a VCD file in order to simulate external events.
- Command syntax and command
The simulator can be controlled via a command line interface. It accepts