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Programming modes Pulse widths Timing diagram for programming and verification Practical part: We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with respect to simplicity.

The only disadvantage of this processor is a small and non-expandable program memory. For example, resident datqsheet programs can do almost anything with the LPT. We are working on a reprint. Features of the AT89C processor: Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits. April – Set the programming mode via pins P3.

AT89CPU Datasheet(PDF) – ATMEL Corporation

Software is written in Pascal, the new version uses the Turbo Vision user interface. 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 and to indicate current process.


Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. According to our measurements, power consumption averages approximately 12 mA.

Atmel AT89C2051 programmer

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. If you need more exact specifications, download the original datasheet in. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch It connects directly to a PC parallel port.

Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way. The circuit is intended for simple applications, where room and number of wires are limited. 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. It still works since Atmels sustain a lot; however, their opinion is included here simply because they are right.

You can view the modified schematics here. It should work with no problem on the first try.

Big thanks to the author. This is an outline of the programming algorithm: The only major inovation over standard series processors is the analog comparator on pins P1. In some cases, it’s better to use a different design for the voltage switching part – see the end of this article.


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. It was designed using common components, with respect to simple construction.

We paid great attention to the timing routines, so it should work on any computer. Optionally, set verification mode via bits P3. A simple programmer for the Atmel AT89c microcontrollers. 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.

There is no further significant power consumption drop at lower clock frequencies. This is one of the simplest programmers. It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

Instead of waiting 1. Its output is accessible to the software via the P3. Data protection system is designed very well.