Programmer for AT89C51/52/55 microcontrollers. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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The programmer is connected to the computer's serial port. When controlling the programmer, only standard Windows API functions are used, so the program must work under all versions of Windows. I tested under Windows 98. If something doesn't work for you, then write, I'll refine it.

The programmer is based on the AT90S4414 microcontroller. Why so expensive, you ask? Yes, the AT89C51 controller could be used. But if you are just about to make a programmer, i.e. you don’t have it, then how will you flash the controller for the programmer? The AT90S4414 is more expensive but has SPI programming capability. The programmer for such a bus consists of 3 resistors, 3 capacitors and quartz and is connected to a parallel port. I used the SP12 programmer from xs4all.nl/~sbolt/e-spider_prog.html. There you can find the LPT port connection diagram and software for various operating systems: DOS/WINDOWS, LINUX and even WINDOWS 2000! By the way, there you can also find a programmer for controllers that are compatible with the MSC-51 family and have an SPI interface: AT89S8252, AT89S53.

For a cheaper option, the COM port to TTL level converter and vice versa is made on discrete elements, although ready-made microcircuits such as DS275, MAX232 could be used, but they must first be found and bought. And two transistors and five resistors with a capacitor can always be found. True, this option has a drawback: the level of logical "0" transmitted by the controller will not be +12 V, but only +5 V. But the serial port standard assumes a logic "0" level of +3...+12V, so +5 is the standard. I did not come up with this converter circuit myself, but found it on the ATMEL atmel.com website. There, this circuit is used in the programmer for microcontrollers of the AVR family. It also states that older I/O boards may not work at this low voltage level.

Below you can download the firmware for the AT90S4414 controller in ROM and HEX formats (SP12 understands both of these formats), the control program, the instructions for assembling and testing the programmer. The control program has a detailed Help.

You can also download descriptions of microcontrollers AT89C51/52/55 and AT89S53 in English. Only the differences between these microcontrollers and the standard sample 87C51 are described.

If you want to learn more about Atmel microcontrollers and have some knowledge of English, you can go to the official Atmel website, atmel.com. There is also a Russian Atmel support site, atmel.ru. True, there microcontrollers of the MSC-51 family (AT89C51, etc.) are not respected, they mainly write about the AVR family (AT90S4414 of these), but in the Q&A section there are links to the MSC-51.

Author: Alexander Fomin, fomalex@mail.ru; Publication: cxem.net

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