The R-51SD is small (1.2" x 2.25") two-layer board designed for embedded applications using an 8051 in the single-chip mode.  

Bare Board                                        Built and tested boards (top and bottom)

The R-51SD is  low cost and flexible, making it ideal as an embedded controller. The R-51SD has 32 I/O lines and one or two serial ports, (two when used with the DS87C520/DS89C420.)   The board can be used with a wide variety of preprogrammed 8x5x processors in the 40 pin dip package. These include chips by Intel, Philips, Infineon, Atmel, SST, and ISSI. (For 44 pin PLCC chips see our R-51SP.)  The R-51SD is populated with parts on both the top and bottom of board allowing for it's extremely small footprint.  
This board use preprogrammed processors.  You can not program the chips on this board.  For a programmer see our board the R-51PB.

Our Reads51 software has been completely updated to support this board.  
Reads51 is an integrated applications software development system, which runs on an IBM PC or compatible host. Reads51 allows writing, compiling, assembling, debugging, downloading, and running applications software in the MCS-51 language. Reads51 contains a C compiler, relative assembler, linker/locator, editor,  chip simulator, assembly language debugger, and host-to-board communications in a user-friendly, menu-driven environment.

Download User's Manual

Download Assembly Manual

Download partial list of chips that will work on this board.

  1-10 11-24
R-51SD   (bare board) $ 5 $ 4
Built and tested boards    
R-51SD  (You provide the processor and clock) $ 20 $ 18
R-51SD   (Atmel 89C52) $ 25 $ 23
R-51SD   (DS87C520, chip is not programmed) $ 35 $ 33
R-51SD   (DS89C420) $ 40 $ 36





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       Last updated 3/18/08