Enima Custom

8051 Development Tools

by Chin-Shiuh Shieh on 10/11/2007 00:47:38

Assembler Simulator Programmer Debugger
C Compiler BASIC Compiler Disassembler
Editor Terminal Emulator Schematic Drawing

Assembler

ASEM-51, by W.W. Heinz, is a free 8051 macro assembler for MS-DOS, Windows and Linux.

Download ASEM-51 v1.3 and unzip it into a sub-directory.

Issue "ASEMW DEMO.A51" within DOS box will process the source file "DEMO.A51" and generate a output file "DEMO.HEX" in Intel-HEX format and a list file "DEMO.LST" in plain text.

Refer to "ASEM_51.DOC" for detail usage. The example program "DEMO.A51" is very instructive.

"ASEMSYM.EXE" is a small utility by Chin-Shiuh Shieh which accept list file from ASEM-51 and produce symbol definition file for NoICE51.

Simulator

JSIM-51 is a free 8051 simulator by Jens Altmann.

Emulator 8051 V1.0 by TS Controls is a software simulator for 8051.

Emily 8051/8052 V1.7 by Dunfield Development Systems is a 8051 software simulator for DOS.

AT89C51 Programmer

ATMEL AT89C51 is an 8051 variant with 4KB on-chip flash ROM.

Wichit Sirichote has announced a freely distributed AT89C51 programmer, Easy-Downloader V2.0 for ATMEL 89C51/52/55.

With Easy-Downloader, a pre-programmed master AT89C51 is controlled via RS-232 by a host program running on PC to program other AT89C51/52/55.

Schematic diagram(pdf)(gif) of Easy-Downloader V2.0 with minor modification by Chin-Shiuh Shieh.

EZ52.HEX: Hex code for the master AT89C51.

EZ Uploader V3.0 for Window or EZ-Downloader V2.0 for DOS: Host program on PC.

Photograph of a finished board:

Run EZ Uploader V3.0 and click the "Com X" port you are using. Click "Send Hexfile" after your chip is identified.

AT89S51 Programmer

ATMEL AT89S51 is an 8051 variant with serial programming interface for its 4KB on-chip flash ROM.

Mohammad Asim Khan has announced a freely distributed AT89S51 programmer, ISP Flash Microcontroller Programmer Ver 3.0a.

A PCB layout (ISP-011704_V0.92.zip) for ISP Flash Microcontroller Programmer Ver 3.0a designed by Wen-Hao Kuo.

Photograph of a finished board of above layout:

In-Circuit-Debugger

NoICE Remote Debugger - 8051 68HC08 68HC11 68HC12 Z80 Z180 6502 etc. is a shareware written by John Hartman.

With NoICE Remote Debugger, a monitor "MON8051.HEX" is programmed into ROM, which is controlled by "NoICE51.EXE" (running on PC) via RS232 to debug user program loaded into RAM.

NoICE for 8051 V5.0 is capable of single step execution, breakpoint execution, register inspection/modification, memory inspection/modification, assembler/disassembler, and more ...

Source code of "MON8051.HEX" is shipped with NoICE. It can be assembled by PseudoSam 8051 Assembler. Users may customize "MON8051.HEX" to fit their own design.

Winbond W78C438B is an 8051 variant with non-multiplex P0,P2,Address/Data Bus, and extra I/O port in 84-pin PLCC package. However, there is no on-chip ROM

Schematic diagram(pdf) of a W78C438B-based 8051 in-circuit-debugger, designed by Chin-Shiuh Shieh.

Above design, having 16KB ROM at 0000h-3FFFh and 32KB RAM at 4000h-BFFFh, is intended to work with NoICE for 8051 V5.0.

"MON8051-W78C438B.HEX" is revised by Chin-Shiuh Shieh according to:

Monitor Code Space: 0000h-3FFFh
User Code/Data Space: 4000h-BF7Fh
Monitor Data Space: BF80h-BFFFh
Baud Rate: 9600bps
RD, WR are used to access external ROM/RAM.
Hand-coded UART on P8.0 and P8.7.

Photograph of a finished board.

Download NoICE v5.0 for Windows or NoICE v3.1 for DOS and run it to unzip the package.

Run "NoICE51.exe" for Windows and set the baud rate to 9600bps.

or run "NoICE51.exe" for DOS and set the baud rate to 9600bps.

NoICE for 8051 v5.0 has an inherent limitation that breakpoints must be at least 3 bytes apart from each other.

The EA/VPP,XTAL1, and XTAL2 of the target circuit must be left opened if a 40-pin cable is used while debugging.

Refer to the on-line help for detail usage of NoICE for 8051 v5.0.

A Brief Note on W78C438B-based 8051 In-Circuit-Debugger with NoICE for 8051.

A possible bug in W78C4538CP.

AT89C51-based 8051 in-circuit-debugger

DS5000-based 8051 in-circuit-debugger

C Compiler

Small Device C Compiler

SDCC - Small Device C Compiler is a free C compiler for 8051, although library is incomplete.

Download sdcc-2.3.0-i586-mingw32msvc.zip and unzip it to "c:\" with directory structure preserved.

Add "c:\sdcc\bin" to DOS search path.

Issue "sdcc --code-loc 0x4000 --xram-loc 0x8000 test.c" within DOS box will generate "test.ihx" in Intel-HEX format, where "--code-loc 0x4000" is an option used to specify starting code address, "--xram-loc 0x8000" is an option used to specify starting address of external data memory.

Refer to "c:\sdcc\share\doc\sdcc\sdccman.pdf" for SDCC Compiler User Guide.

uart.c is a UART library by Chin-Shiuh Shieh, including Character, String, and Integer I/O. Refer to sample.c for its usage.