8051 emulator
10/21/2000 - Complete DOS emulator (beta 0.01.15) (c) City University of Hong Kong, also posted on Chunngok home page.
10/12/2000 - C++ translation of my 8051 emulation code (beta 0.00.15), courtesy of chunngok.
The 8051 micro-controller has a simple and efficient 8 bits CPU core, with a RISC-like instruction set. It has special features for embedded systems like bit test instructions, and register bank switching. It is often programmed using assembly language or high-level languages (but has a limited number of addressing modes which limits its ability to handle large or complex arrays of data). Besides its lack of debugging feature, it's a real sleek CPU for embedded applications.
The 8051 is often opposed to the Motorola 68HC11.
The 68HC11 has a CISC instruction set and numerous on-chip peripherals.
It is well suited for high-level languages like C because it has numerous addressing modes (but its instruction and register set is awkward because backward compatibility was kept with precedent members of the 6800 family).
A 8051 CPU emulation core
I wrote an 8051 CPU emulation core with complete instruction-set support. The core is fast and has been well tested. The Intel MCS-51 BASIC interpreter code runs perfectly as an example, see the example application below.
- The CPU core is fully emulated, all instructions.
- Interrupts are not emulated (which would be pretty easy to add).
- On-chip peripherals are not emulated (which would be much more complex to do completely and accurately).
You can find here:
- a 8051 CPU emulator/disassembler source-code (v1.00, for delphi2+)
- a MCS-51 BASIC terminal application (173KB) for Win95/98/NT, that demonstrates the CPU emulator capability
Fell free to use both of them for any purpose.
8051 related links:
- Turbo51, a free pascal compiler for the 8051 microcontroller family.
- JSIM51 simulator, a software emulator.
- SDC51 C Compiler, a C compiler that targets the Intel 8051.
- 8052.COM, an 8031 Resource.
- 8051 Tools, Paul's Free 8051 Tools, Code and Projects.
- Embedded Pascal 8052
- MCS-51 Tiny BASIC
- GNUPic, Free Microcontroller Software Tools.
- Intel 8051 Model, a VHDL synthesizable model of the 8051.
8051 architecture and instruction set (in pdf format):
- Philips 80C51 family architecture (165 KB)
- Philips 80C51 family programmer's guide and instruction set (272 KB)
- Philips 80C51 family hardware description (347 KB)
- Siemens C500 Architecture & Instruction Set Manual (1.1 MB) (upward compatible with the 8051)
- Intel MCS(R) 51 Micro-controller Family User's Manual (15 MB) (huge file! well, that's just the original data-book scanned)