tured using Atmel’s high density nonvolatile memory technology and is Flash on a monolithic chip, the Atmel AT89C is a powerful microcomputer which. 89C datasheet, 89C pdf, 89C data sheet, datasheet, data sheet, pdf, Atmel, 8-Bit Microcontroller with 2K Bytes Flash. ATMEL89C – The AT89C is a low-voltage, high-performance CMOS 8- bit microcomputer with 2K bytes of Flash programmable and erasable read-only.

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Listing Three is C code to interface the controller through the PC parallel port. Full duplex programmable serial port.

It also affords two software-selectable save-power modes. It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

It should work with no problem on the first try. It was designed using common components, with respect to simple construction. Port1 output buffers have a 20 mA sink current capacity and can drive LEDs directly. In this section, I’ll present a simple programmer for AT89C that is hosted on a based circuit running a Basic interpreter. You can also purchase off-the-shelf programmers for these devices see Airborn Electronics at http: 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.

Atmel’s AT89C2051 Microcontroller

Consequently, I decided to build a simple programmer using circuits I had available. Port3 bits can also sink up to 20 mA of current, and when written with ones, can be used as inputs. For example, resident printing programs can do almost anything with the LPT.


A trigger input that triggers the converter into the requested mode. By writing ones to the Port1 bits, they can be used as input bits.

89C Datasheet(PDF) – ATMEL Corporation

Table 2 identifies the various modes for erasing, programming, and verifying the chip. The code memory is programmed one byte at a time. After the code is burnt into the chip, the programmer power dataasheet is turned off before removing the target chip. As Table 1 shows, Port3 pins P3.

ATMEL 89C2051

A simple programmer for the Atmel AT89c microcontrollers. The microcontroller serial port operates in mode 0, in which the serial port works as a shift register, either as input or output. However, once a suitable programmer is available, using the microcontroller is straightforward. The AT89C data sheet states that the on-chip oscillator can be used with a ceramic resonator as well as a resonant crystal element to provide the basic clock to the microcomputer.

The interface is ideally suited for data acquisition on PC compatibles using the parallel printer adapter signals. The analog input voltage range of the 892051 is 0 to 4. The pin AT89C, with its many hardware features, is especially attractive to developers because it is compatible with the and similar devices, and daasheet reduce board space, components, and cost. The lowest power consumption can be achieved with clock frequency of 2 MHz, and amounts to about 6 mA for the processor itself add 89c2501 for a miniature The AT89C microcontroller can endure one thousand program and erase cycles.

The amount of PEROM programmable and erasable read-only memory available on the AT89C is sufficient for most applications, including use in portable instruments, supervisory-control applications, autonomous robots, and more. Figure 4 shows the block diagram, and Figure 5 see page 55 shows the circuit schematic.


There is no further significant power consumption drop at lower clock frequencies. The only major inovation over standard series processors is the analog comparator on pins P1.

Using the Converter The converter interface is designed so that it can be used in any embedded application. After I was satisfied that things were working, I went ahead with more serious applications. The target chip is then ready to be inserted into the target system. After the controller has been programmed, to reprogram any nonblank byte, the entire chip has to be electrically erased.

Big thanks to the author. A done flag that indicates the end of operation. While there are parallel output bit multichannel ADCs of similar performance, I decided to use available components to get the system working.

This is one of the simplest programmers. Thus, it is possible to port existing applications to an AT89C without change to the object code — as long as the software limits itself to the available hardware resources, including memory and ports.

Instruction compatible with MCS After the 8-bit data is shifted out, the controller program converts the serial port as an input shift register and reads back the converted ADC data as 2 bytes.