P0 is for bi-directional data transferring. The 89C51 with ez52.hex receives a 9600 baud serialdata from PC and generates the appropriated signal applying to the ZIFsocket. Hardware Figure 1 shows the circuit diagramof Easy-Downloader V2.0. After compiling the sourcefile in Assembly or C then download the hex file to the chip directly byusing A:>ez2 myfirst(.hex), say. This version is capable of writing intel-HEXfile to a 89C51(4kB), 89C52(8kB) and 89C55(20kB). It's suitable and cheapwhich anyone can build easily. Introduction If you need more code spacefor your application, particularly for developing 89Cxx projects with Clanguage, the Easy-Downloader V2.0 is the answer. Wichit Sirichote, Build your own a programmer for writing intel-HEX file to the 89C51, 89C52 and 89C55, PCB file included, Window version UPLOADER EZ3, EZ3.1, modified source code with sdcc Download Driver Jr Programmer V2.
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