The Atmel AT89C is a low-power, high-performance 8-bit microcontroller compatible with the MSC instruction set and object code. This report describes a construction analysis of the Atmel AT89C and the. AT89S 8-Bit Microcontrollers. Ten AT89C devices encapsulated in . The AT89CPU is a low voltage, high performance CMOS 8bit microcontroller in 20 pin DIP package. The device is manufactured using Atmel’s high.

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The result of my design was a solution that offers a nibble wide input and output interface that, though tailored to connect to the PC parallel port, could be used anywhere else.

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

The only disadvantage of this processor is a small and non-expandable program memory. Table 2 identifies the various modes for erasing, programming, and verifying the chip.

Atmel AT89C2051 programmer

There is no further significant power consumption drop at lower clock frequencies. In this section, I’ll present a simple programmer for AT89C that is hosted on a based circuit running a Basic interpreter. Instruction compatible with MCS A trigger input that triggers the converter into the requested mode.

Using the Converter The converter interface is microcontroler so that it can be used in any embedded application.

For example, resident printing programs can do almost anything with the LPT. Figure 4 shows the block diagram, and Figure 5 see page 55 shows the circuit schematic. The circuit is intended for simple applications, where room and number of wires are limited. Optionally, set verification mode via microcontrolle P3. The target chip is then ready to be inserted into the target system. Consequently, I decided to build a general-purpose interface that could be used in other applications.


With 4 bits of mode input, up to 16 modes see Table 3 of operation can be implemented. AT89C can be operated with a clock frequency between 0 and 24 MHz. It connects directly to a PC parallel port. The interface is ideally suited for data acquisition on PC compatibles using the parallel printer adapter signals. 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.

This means that all jumps ljmp and calls lcall microcontrroller be limited to maximum physical address 0x7FF. Instead of waiting 1. As Table 1 shows, Port3 pins P3. It should work with no problem on the first try. The operation is similar to that of an It was designed using common components, with respect to simple construction.

The analog input voltage range of the ADC is 0 to 4. The converter outputs are:.

Atmel AT89C programmer |

To communicate with the BASIC system, the terminal at89c20051 can use any xt89c2051 baud rate as well as transmission settings number of bits, parity, and so on. The converter provides access to eight channels of bit ADC. The mode input to the converter determines what task the controller will perform when it is triggered. The code memory is programmed one byte at a time. In some cases, it’s better to use a different design for the voltage switching part – see the end of this article.

A done flag that indicates the end of operation. This is an outline of the programming algorithm: Port3 bits can also sink up to 20 mA of current, and when written with ones, can be used as inputs. Erasing the chip is a microcontrolleer task that takes a few milliseconds to execute.


By writing ones to the Port1 bits, they can be used as input bits.

Features of the AT89C processor: An external clock source with suitable levels can also be used instead of a crystal or a resonator. Set the programming mode via pins P3. However, once a suitable programmer is available, using the microcontroller is straightforward.

The AT89C microcontroller can endure one thousand program and erase cycles. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch This programmer is a part of the LAB system. 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.


The limits for the programming voltage for the AT89C are between While there are parallel output bit multichannel ADCs of similar performance, I decided to use available components to get the system working. You can also purchase off-the-shelf programmers for these devices see Airborn Electronics at http: An error flag indicating an attempt to launch a nonimplemented mode of operation.

After the code is burnt into the chip, the programmer power supply is turned off before removing the target chip. Programming modes Pulse widths Timing diagram for programming and verification Practical part: