Sunday, July 15, 2012


Atmel is a product AT89S51/AT89S52 that quite a lot in the market with a price of less than 20 thousand rupiah. To start learning mikrokontroler type 89S51 this we need a programmer And Rangkaian Downloader. Programmer is a hardware device that is used to enter the machine language program code compilation that we write to in mikrokontroler.

Downloader AT89S51/AT89S52
Gambar Skema Rangkaian Downloader AT89S51/AT89S52

picture above shows the circuit diagram of the in-system programmer interface, the power to the interface is provided by the target system. The 74HCT541 ic isolate and buffer the parallel port signals. It is necessary to use the HCT type ic in order to make sure the programmer should also work with 3V type parallel port.

Skema rangkaian downloader ini can be use to program the 89S series devices and the AVR series devices which are pin compatible to 8051, like 90S8515. For other AVR series devices the user can make an adapter board for 20, 28 and 40 pin devices. The pin numbers shown in brackets correspond to PC parallel port

Software ISP

The file contains the main program and the i / o port driver. Place all files in the same folder. The main screen view of the program is shown in the picture below.

Following are the main features of this software,
  • Read /write the Intel Hex file
  • Read the signature, lock and fuse bits
  • Clear/Fill memory buffer
  • Verify with memory buffer
  • Reload current Hex File
  • Display buffer checksum
  • Program selected lock bits & fuses
  • Auto detection of hardware

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