AT89CPI datasheet, AT89CPI pdf, AT89CPI data sheet, datasheet, data sheet, pdf, Atmel, 8-Bit Microcontroller with 2K Bytes Flash. The AT89C is a low-voltage, high-performance CMOS 8-bit The AT89C provides the following standard features: 2 Kbytes of Flash, bytes of. AT89CPI 8-bit Microcontroller With 2Kbytes Flash, V to V Features. Compatible with MCSTM Products 2 Kbytes of Reprogrammable Flash.

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This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not datasheeh. Under steady state non-transient conditions, IOL must be externally limited as follows: Printed on dagasheet paper.

Both software versions support so-called DEBUG mode, that should greatly simplify any troubleshooting. For applications involving interrupts the normal interrupt service routine address locations of the 80C51 family architecture have been preserved. Instead of waiting 1. Apply the appropriate control signals for Read Code data and read the output data at the port P1 pins.

Verification of the lock bits is achieved by observing that their features are enabled.

AT89CPI Datasheet(PDF) – ATMEL Corporation

Programming modes Pulse widths Timing diagram for programming and verification Practical part: The mode is invoked by software. Once the write cycle has been completed, true data is valid on all outputs, and 6 AT89C the next cycle may begin.

Port 3 Figure 1. In that case, the reset or inactive values of the new bits will always be 0.

AT89CPI Datasheet pdf – 8-Bit Microcontroller with 2K Bytes Flash – Atmel

The signature bytes are read by the same procedure as a normal verification of at89cc2051-24pi H, H, and H, except that P3. Repeat steps 5 through 8, changing data and advancing the address counter for the entire 2K bytes array or until the end of the object file is reached.


This is an outline of the programming algorithm: Apply data for Code byte at location H to P1. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein.

Reading the Signature Bytes: You can view the modified schematics here. As inputs, Port 3 pins that are externally being pulled low will source current IIL because of the pullups. The idle mode can be terminated by any enabled interrupt or by a hardware reset.

To Program and Verify the Array: If lock bits LB1 and LB2 have not been programmed code data can be read back via the data lines for verification: It should work with no problem on the first try.

AT89C2051-24PI Datasheet

Data Polling may begin any time after a write cycle has been initiated. 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.

Holding the RST pin high for two machine cycles while the oscillator is running resets the device. Increment address counter by 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.

The write operation cycle is selftimed and once initiated, will automatically time itself to completion. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. Several people have independently pointed out that the voltage switches are not designed in a totally “clean” way. Read the next code data byte at the port P1 pins. A typical 80C51 assembler will still assemble instructions, even if they are written in violation of the restrictions mentioned above.


During a write cycle, an attempted read of the last byte written will result in the complement of the written data on P1. Datashewt circuit is intended for simple applications, where room and number of wires are limited.

Violating the physical space limits may cause unknown program behavior. It contains 2K bytes of flash af89c2051-24pi memory.

There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed. Apply new data to the port P1 pins. The reset should not be activated before VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize.

This is one of the simplest programmers. Current nibble high or at89c2051–24pi is determined by the state of the 6Q bit pin 14 of the system latch Lock bits programmed AT89C 6. Terms and product names in this document may be trademarks of others. According to our measurements, power consumption averages approximately 12 mA.