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Big thanks to the author. Optionally, set verification mode via bits P3. 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. 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.

Set the programming mode via pins P3. The original design used the circuit; however, its use datasheett not prove to be useful due to the parallel port output design see the article about LPT. According to our measurements, power consumption averages approximately 12 mA.

Its output is accessible to the software via the P3. It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

April – 24puu simple programmer for the Atmel AT89c microcontrollers.

Atmel AT89C2051 programmer

We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with respect to simplicity. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch Software is written in Pascal, the new version uses the Turbo Vision user interface.


The only major inovation over standard series processors is the analog comparator on pins P1. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way.

My objective was to build a simple programmer, that would be easy to make at home and would work without significant problems on the first try. This is one of the simplest programmers.

The circuit is intended for simple applications, where room and number of wires are limited. It is completely independent, but it was developed as its component 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.

It still works since Atmels sustain a lot; however, their opinion is included here simply because they are right. Instead of waiting 1. LEDs are used to decrease voltage and to indicate current process.

Programming modes Pulse widths Timing diagram for programming and verification Practical part: We paid great attention to the timing routines, so it should work on any computer. 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.

Atmel AT89C programmer |

You can view the modified schematics here. This is an outline of the programming algorithm: Data protection system is designed very well. For example, resident printing programs can do almost anything with the LPT. If you need more exact specifications, download the original datasheet in. It connects directly to a PC parallel port. Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting.


There is no further significant power consumption drop at lower clock frequencies.

AT89CPU Datasheet(PDF) – ATMEL Corporation

It should work with no problem on the first try. 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.

Data reading and verification is controlled by circuit – datasheeet multiplexers, allowing to read 8 bits via four parallel port input bits. It was designed using common components, with respect to simple construction. Increment address counter by pulsing XTAL1, set next instruction code via P1 Repeat steps 5 to 8 until the 2kB boundary ay89c2051 reached, or until the whole file has been programmed into the chip. We are working on a reprint. The lowest power consumption can at89x2051 achieved with clock frequency of 2 MHz, and amounts to about 6 mA for the processor itself add 2mA for a miniature In some cases, it’s better to use a different design for the voltage switching part – see the end of this article.

The only disadvantage of this processor is a small and non-expandable program memory. This xt89c2051 is a part of the LAB system. Features of the AT89C processor: