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Atmel AT89C programmer |

This programmer is a part of the LAB system. Current nibble high or low is determined by the state of the 6Q bit pin wt89c2051 of the system latch Big thanks to the author.

Programming modes Pulse widths Timing diagram for programming and verification Practical part: We are working on a reprint. For example, a8t9c2051 printing programs can do almost anything with the LPT. April – A simple programmer for the Atmel AT89c microcontrollers.

Atmel AT89C2051 programmer

There is no further significant power consumption drop at lower clock frequencies. Instead of waiting 1. 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.

LEDs are used to decrease voltage and to indicate current process. In some cases, it’s better to use a different design for the voltage switching part – see the end of this article. Features of the AT89C processor: If you need more exact specifications, download the original datasheet in. Or, “in an vatasheet, you can use two standard cheap sockets inserted into each other, so the soldered one is not subject to excessive mechanical stress.


According to our measurements, power consumption averages approximately 12 mA. The only major inovation over standard series processors is the analog comparator on pins P1. Software is written in Pascal, the new version uses the Turbo Vision user interface. Optionally, set verification mode via bits P3.

Data protection system is designed very well. This is one of the simplest programmers. 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 at89v2051 LPT.

The only disadvantage of this processor is a small and non-expandable program memory. 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.

Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. It should work with no problem on the first try.

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. Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits. It connects directly to a PC parallel port. The lowest power consumption can be achieved with clock frequency of 2 MHz, and amounts to about 6 mA for the processor itself add fatasheet for a miniature It is completely independent, but it was developed as its component Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way.


AT89CPU – AT89C Pin 24MHz 2kb 8-bit Microcontroller Technical Data

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. You can view the modified schematics here. 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. 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.

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.

The circuit is intended for simple applications, where room and number of wires are limited. It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

This is an outline of the programming algorithm: Set the programming mode via pins P3.

It still works since Atmels sustain a lot; however, their opinion is included here simply because they are right. Its output is accessible to the software via the P3. We tried to minimize this influence in our design; however, there is no at892c051 to remove these side effects completely with respect to simplicity.