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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I found I could modify an existing IntelHex loader program for the Basic system to get the required programmer code. This means that all jumps ljmp and calls lcall must be limited to maximum physical address 0x7FF.

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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. 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. We are working on a reprint. This programmer is a part of the LAB system.

Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. 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. Programming modes Pulse widths Timing diagram for programming and verification Practical part: The only disadvantage of this processor is a small and non-expandable program memory.

Consequently, I decided to build a simple programmer using circuits I had available. 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. However, once a suitable programmer is available, using the microcontroller is straightforward.

The pin AT89C, with its many hardware features, is especially attractive to developers because it is compatible with the and similar devices, and can reduce board space, components, and cost.


A PC with an assembler and terminal-emulation program I use Vterm are the only tools required for programming and using the AT89C The controller programs the serial port as an output shift register in the beginning of the acquisition cycle during which the MAX needs the 8-bit control byte that contains conversion parameters, channel number, and so on.

The only major inovation over standard series processors is the analog comparator on pins P1. However, the driver software for the programmer does not support IntelHex object files. 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 April – We paid great attention to the timing routines, so it should work on any computer.

Atmel’s AT89C2051 Microcontroller

Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch 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.

The Atmel application sheets describe a simple programmer that lets you perform microcontroloer variety of operations with the flash controller, including erasing, reading, programming, and verifying the contents of the target chip see http: As Table 1 shows, Port3 pins P3.

LEDs are used to decrease voltage and to indicate current process. The use of static memory allows the device to be operated at zero frequency.

Using an capacity controller to parallelize serial ADC data might be considered overkill. Figure 4 shows the block diagram, and Figure 5 see page 55 shows the circuit schematic. The converter outputs are:.

The mode input to the converter determines what task the controller will perform when it is triggered. The received hex code is stored in the External RAM of the system.

Full at89f2051 programmable serial port.

Atmel AT89C programmer |

Instead of waiting 1. The interface is ideally suited for data acquisition on PC compatibles using the parallel printer adapter signals. Subsequently the system is loaded with the code in Listing One from within the terminal-emulator environment. It was designed using common components, with respect to simple mircocontroller.


A done flag that indicates the end of operation. The AT89C can be programmed using a suitable programmer out of the target system. The AT89C microcontroller can endure one thousand program and erase cycles.

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. 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. Increment address counter microcomtroller 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.

AT89C can be operated with a clock frequency between 0 and 24 MHz. Big thanks to the author. Use as controllers in portable instruments is further simplified by the low power consumption and wide operating voltage range.

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. Port1 output buffers have a 20 mA sink current capacity and can drive Microconttoller directly. It is completely independent, but it was developed as its component It is definitely better to use two 8-bit “D” flip-flopswhich are triggered by edge, not by level.

The Vpp generation circuit applies a logic 0 to the RST pin at power on. Figures 1 and 2 show the block diagram for programming and verifying the Flash-memory contents of an AT89C