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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Programming modes Pulse widths Timing diagram for programming and verification Practical part: 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. Using an capacity controller to parallelize serial ADC data might be considered overkill. The converter provides access to eight channels of bit ADC. According to our measurements, power consumption averages approximately 12 mA.

Instead of waiting 1.

The Basic program is then ready to accept IntelHex format object files. The interface is ideally suited for data acquisition on PC compatibles using the parallel printer adapter signals. Its output is accessible to the software via the P3. AT89C can be operated with a clock frequency between 0 and 24 MHz. The only disadvantage of this processor is a small and non-expandable program memory. Power-down mode saves the RAM contents but freezes the oscillator, disabling all other activity until the next hardware reset.


It was designed using common components, with respect to simple construction. Thus, it is possible to port existing applications to an AT89C without change to the object code mjcrocontroller as long as the software limits itself to the available hardware resources, including memory and ports.

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

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Features of the AT89C processor: Consequently, I decided to build a general-purpose interface that could be used in other applications. A trigger input that triggers the converter into the requested mode. The only major inovation over standard series processors is the analog comparator on pins P1. Figure 3 shows the circuit schematic for the programmer. This means that all jumps ljmp and calls lcall must be limited to maximum physical address 0x7FF.

The analog input voltage range of the ADC is 0 to 4. However, the driver software for the programmer does not support IntelHex object files.

A done flag that indicates the end of operation. Two bit programmable timers. However, once a suitable programmer is available, using the microcontroller is straightforward. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way. 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 mkcrocontroller to heat.

Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits. Port1 and Port3 are compatible to imcrocontroller P1 and P3 on an except Port1.


Atmel AT89C programmer |

Use as controllers in portable instruments is further simplified by the low power consumption and wide operating voltage range. Subsequently the system is loaded with the microocntroller in Listing One from within the terminal-emulator environment.

Both software versions support microconroller DEBUG mode, that should greatly simplify any troubleshooting. There is no further significant power consumption drop at lower clock frequencies.

This is possible because the chip uses static memory. 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.

AT89C – Microcontrollers and Processors – Microcontrollers and Processors

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. 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. Port1 output buffers have a 20 mA sink microcontroler capacity and can drive LEDs directly.