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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Table 2 identifies the various modes for erasing, programming, and verifying the chip. Subsequently the system is loaded with the code in Listing One from within the terminal-emulator environment. Figure 3 shows the circuit schematic for the programmer.

A trigger input that triggers the converter into the requested mode. Programming modes Pulse widths Timing diagram for programming and verification Practical part: 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.

Features of the AT89C processor: In the shift register mode, the TxD pin supplies the shift clock, and the RxD pin provides the data or reads the external data as per the direction. Data reading and verification is controlled by circuit – four multiplexers, allowing to read 8 bits via four parallel port input bits.

A simple programmer for the Atmel AT89c microcontrollers. I found that the AT89C worked well. Listing Three is C code to interface the controller through the PC parallel port.

Atmel AT89C programmer |

We paid great attention to 89c22051 timing routines, so it should work on any computer. After I was satisfied that things were working, I went ahead with more serious applications.


To communicate with the BASIC system, the terminal emulator can use any standard baud rate as well as transmission settings number of bits, parity, and so on. A done flag that indicates the end of operation.

Atmel’s AT89C2051 Microcontroller

The analog input voltage range of the ADC is 0 to 4. While there are parallel output bit multichannel ADCs of similar performance, I datwsheet to use available components to get the system working.

Two bit programmable timers. 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 8c2051 the hex file is successfully received, the programmer proceeds with erasing the AT89C, then begins programming it with the user object code.

The code memory is programmed one byte at a time. April – 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. Or, “in an emergency”, you can use two standard cheap datashset inserted into each other, so the soldered one is not subject to excessive mechanical stress.

Erasing the chip is a simple task that takes a few milliseconds to execute. Figures 1 and 2 show the block diagram for programming and verifying the Flash-memory contents of an AT89C Port1 output buffers have a 20 mA sink current capacity and can drive LEDs directly. 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.

89C Datasheet(PDF) – ATMEL Corporation

Low-power and power-down modes. The use of static memory allows the device to be operated at zero frequency.


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. According to our measurements, power consumption averages approximately 12 mA. AT89C can be operated with a clock frequency between 0 and 24 MHz.

It connects directly to a PC parallel port. An error flag indicating an attempt to launch a nonimplemented mode of operation.

Atmel AT89C2051 programmer

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 operation is similar to that of an 89cc2051 The Vpp generation circuit applies a logic 0 to the RST pin at power on.

After the code is burnt into the chip, the atnel power supply is turned off before removing the target chip. Current nibble high or low is determined by the state of the 6Q bit pin 14 of the system latch The mode input to the converter determines what task the controller will perform when it is triggered.

After the 8-bit datasheeh 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. Its output is accessible to the software via the P3. Software is written in Pascal, the new version uses the Turbo Vision user interface.