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In some cases, it’s better to use a different design for the voltage switching part – see the end of this article.

Its output is accessible to the software via the P3. 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. A simple programmer for the Atmel AT89c microcontrollers. It still works since Atmels sustain a lot; however, their opinion is included here simply because they are right.

The only major inovation over standard series processors is the analog comparator on pins P1. Data protection system is designed very well. It connects directly to a PC parallel port. Features of the AT89C processor: This is one of the simplest programmers.

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 is completely independent, but it was developed as its component 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.


Set the programming mode via pins P3. This is an outline of the programming algorithm: Big thanks to the author. Programming modes Pulse widths Timing diagram for programming and verification Practical part: It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level. 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. If you need more exact specifications, download the original datasheet in.

Software is written in Pascal, the new version uses the Turbo Vision user interface.

Atmel AT89C2051 programmer

There is no further significant power consumption drop at lower clock frequencies. In the first case, it’s not datxsheet to use the stabilisers; when an input voltage is connected to their outputs, they consume about 50 mA and convert it to heat.

Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting.

We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with xatasheet to simplicity. Optionally, set verification mode via bits P3. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way.

AT89CPU Datasheet(PDF) – ATMEL Corporation

We are working on a reprint. The only disadvantage of this processor is a small and non-expandable program memory.


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 ddatasheet been programmed into the chip. April – 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 was designed using common components, with respect to simple construction. According to our measurements, power consumption averages approximately 12 mA. Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits.

This programmer is a part of the LAB system.

My objective was to build a simple programmer, that would be easy to make at home datasheey would work without significant problems on the first try. 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 The circuit is intended for simple applications, where room and number of wires are limited.

LEDs are used to decrease voltage and to indicate current process. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch For example, resident printing programs can do almost anything with the LPT. You can view the modified schematics here.