Hello,. i am a newbie with ATMEL MCU family,. but i want to change the software on a AT89C wich contains an “HORLOGE 7 segm. Introduction to Programming With AT89C (Guest Starring: Arduino): The (also known as MCS) is an MCU design from the 80’s that remains. This is Linux software for idea from former Silicon studio parallel port programmer for AT89C microcontroller. It is a direct translation of the.

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This is an outline of the programming algorithm: The circuit is intended for qt89c2051 applications, where room and number of wires are limited. We paid great attention to the timing routines, so it should work on any computer. We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with respect to simplicity.

Arduino-based AT89C2051 programmer

The only disadvantage of this processor is a small and non-expandable program memory. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way.

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. LEDs are used to decrease voltage and proframmer indicate current process. 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.

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. Optionally, set verification mode via bits P3.


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.

Or, “in an emergency”, you can use two progeammer cheap sockets inserted into ag89c2051 other, so the soldered one is not subject to excessive mechanical stress. 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 We are working on a reprint.

Set the programming mode via pins P3. This programmer is a part of the LAB system. 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. The original design used the circuit; however, its use did not prove to be useful due to the parallel proogrammer output design see the article about LPT.

Atmel AT89C2051 programmer

In some cases, it’s better to use a different design for the voltage switching part – see the end of att89c2051 article. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch If you need more exact specifications, download the original datasheet in.

Software is written in Pascal, the new programmee uses the Turbo Vision user interface. 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. According to our measurements, power consumption averages approximately 12 mA. Instead of waiting 1. The only major inovation over standard series processors is the analog comparator on pins P1.


A simple programmer programmet the Atmel AT89c microcontrollers. For example, resident printing programs can do almost anything with the LPT. It should work with no problem on the first try.

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

AT89C Programmer

It is completely independent, but it was developed as its component Data protection system is designed very well. Big thanks to the author. Programming modes Pulse widths Timing diagram for programming and verification Practical part: Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits.

It was designed using common components, with respect to simple construction. 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. Features of the AT89C processor: Its output is accessible to the software via the P3.

It connects directly to a PC parallel port.

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