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It connects directly to a PC parallel port. Due to undefined state of the LPT port after running some applications, it is necessary to turn on the power for the programmer AFTER starting the control software. You can view the modified schematics here. It still works since Atmels sustain a lot; however, their opinion is included here simply because they are right.

Data protection system is designed very well. My objective was to build a datadheet programmer, that would be easy to make at home and would work without significant problems on the first try.

Big thanks to the author. This is an outline of the programming algorithm: With the AT89C51, it is not even possible to transfer contents of the internal FLASH memory if an external memory with a special software is attached to it.

Atmel AT89C programmer |

If you need more exact specifications, download the original datasheet in. According to our measurements, power consumption averages approximately 12 mA. The only disadvantage of this processor is a small and non-expandable program memory.


Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way. It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

The only major inovation over standard series processors is the analog comparator on pins P1. There is no further significant power consumption drop at lower clock frequencies.

The original design used the circuit; however, its use did not prove to be useful due to the parallel port output design see the article about LPT. Optionally, set verification mode via bits P3. April – This is one of the simplest programmers. In some st89c2051, it’s better to use a different design for the voltage daatasheet part – see the end of this article. It was designed using common components, with respect to simple construction. The circuit is intended for simple applications, where room and number of wires are limited.

Its output is accessible to the software via the P3.

Atmel AT89C2051 programmer

Software is written in Pascal, the new version uses the Turbo Vision user interface. We paid great attention to the timing routines, so it should work on any computer. It’s a pity it can’t run just with a RC-circuit for clock signal generating, and that an OTP version is not available. LEDs are used to decrease voltage datazheet to indicate current process.

It should work with no problem on the first try. A simple programmer for the Atmel AT89c wt89c2051. Increment address counter by pulsing XTAL1, set next instruction code via P1 Repeat steps 5 to 8 until the 2kB boundary is reached, or until the whole file has been programmed into the chip.


Instead of waiting 1. Set the programming mode via pins P3. In the first case, it’s not recommended to use the stabilisers; when an input voltage is connected to their outputs, they consume about 50 mA and convert it to heat.

We are working on a reprint. Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits. Features of the AT89C processor: We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with respect to simplicity.

Or, “in an emergency”, you can use two standard cheap sockets inserted into each other, so the soldered one is not subject to excessive mechanical stress. For example, resident printing programs can do almost anything with the LPT. Programming modes Pulse widths Timing diagram for programming and verification Practical part: Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch This programmer is a part of the LAB system.

The lowest power consumption can be achieved with clock frequency of 2 MHz, and amounts to about 6 mA for the processor itself add 2mA for a miniature It is completely independent, but it was developed as its component

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