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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We are working on a reprint. Increment address counter by pulsing XTAL1, set next instruction at89c0251 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 microcontroller serial port operates in mode 0, in which the serial port works as a shift register, either as input or output.

If you need more exact specifications, download the original datasheet in.

AT89C2051 Microcontroller

We paid great attention to the timing routines, so it should work on any computer. Data protection system is designed very well. Big thanks to the author. Full duplex programmable serial port. For this design, only 11 combinations are required; the rest can be used later for expansion.

With 4 bits of mode input, up to 16 modes see Table 3 of operation can be implemented.

Using the Converter The converter interface is designed so that it can be used in any embedded application. The target chip is then ready to be inserted into the target system.

My good friend Dr. There is no further significant power consumption drop at lower clock frequencies. Subsequently the system is loaded with the code in Listing One from within the terminal-emulator environment. Power-down mode saves the RAM contents but freezes the oscillator, disabling all other activity until the next hardware reset. We tried to minimize this influence in our design; however, there is no way to remove these side effects completely with respect to simplicity.


A PC with an assembler and terminal-emulation program I use Vterm are the only tools required for programming and using the AT89C For example, resident printing programs can do almost anything with the LPT. Consequently, I decided to build a simple programmer using circuits I had available. Figures microcontrollfr and 2 show the block diagram for programming and verifying the Flash-memory contents of an AT89C Set the programming mode via pins P3.

Consequently, I decided to build kicrocontroller general-purpose interface that could be used in other applications. 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.

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

Optionally, set verification mode via bits P3. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch 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 MAX had everything we needed, except that the chip operates at serial clock with a minimum clock-frequency requirement of KHz which would be difficult to generate under program control on older PCs.


However, the driver software for the programmer does not support IntelHex object files. Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. Port3 pins also serve alternate functions to be discussed shortly.

Instead of waiting 1. Port1 and Port3 are compatible to the P1 and P3 on an except Port1.

A done flag that indicates the end of operation. The received hex code is stored in the External RAM of the system. Two bit programmable timers. This means that all jumps ljmp and calls lcall must be limited to maximum physical address 0x7FF. The circuit is intended for simple applications, where room and number of wires are limited.

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.

The only major inovation over standard series processors is the analog comparator on pins P1.

A clear-status input that is used to erase previous status information. Port3 bits can also sink up to 20 mA of current, and when written with ones, can be used as inputs.

It is completely independent, but it was developed as its component The interface is ideally suited for data acquisition on PC compatibles using the parallel printer adapter signals.