The Microchip Technology Inc. 25AA/25LC/ products meet the specification contained in their particular Microchip Data Sheet. The 25LC is a 32K bit Serial Electrically Erasable PROM with memory accessed via a simple Serial Peripheral Interface (SPI&#;) View Datasheet. 25LC datasheet, 25LC pdf, 25LC data sheet, datasheet, data sheet, pdf, Microchip.

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Next we send our bytes of data from our buffer array, one byte after another without pause. This is accomplished by sending the required command, address and data serially one bit at a time over single pins instead of the multiple pins of a parallel part. Serial Peripheral Interface SPI is a synchronous serial data protocol used by Microcontrollers for communicating with one 225lc320 more peripheral devices quickly over short distances.

In this mode, datsaheet bits arranged memories require 8 pins from the micro-controller which is too much pins consuming even though the gain in speed is noticeable.

EPROM Programmer Device Support

Note that the chip on the Arduino board contains an internal EEPROM, so follow this tutorial only if you need more space than it provides. These parts appeared in the mid to early ‘s and most are still manufactured today. This function could easily be changed to fill the array with data relevant to your application:. The device is enabled by pulling the Chip Select CS pin low.

Next post on same subject. The core number datashewt normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers. Most devices, regardless of the technology family, can be identified by their CORE part number.


My preference goes to SPI in spite of the highest number of pin required. The example below describes how to determine a typical core part number.

Note char buffer []. Pre-processor directives are processed before the actual compilation begins. Each has the manufacturers full part number printed on the device.

Care shall be taken at the B versions which have a different meaning! Next is a short recap of the chip properties Reference Max. Insert the AT25HP chip into the breadboard. They differ from their supply voltages:. The CORE part number for each device is This approach allows you to more easily locate a device number, as many users do not know the manufacturer of the device in which they have interest.

An explanation of bit masks can be found here. A core part number is a number which identifies a device regardless of the manufacturer. We send the 16 bit address to begin writing at in two bytes, Most Significant Bit first. Once they are programmed they cannot be changed.

In absolute, SPI is faster and I use this protocol a lot in my applications. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count. The device also offers various degerees dataheet write protection and a hold pin, but we won’t be covering those in this tutorial. 25l3c20 Part 3 Posted on datxsheet Jan Here we allocate the global variables we will be using later in the program.

The images on the bottom right are close-up views of the first three eprom packages. Data registers simply hold bytes. Usually each bit in a control register effects a particular setting, such as speed or polarity.

The first step is setting up our pre-processor directives. The listed device numbers conform to the core numbers used by most industry standard parts.


In other words, you may read carefully the chip data sheets before trying to tweak the proposed code. When the address argument is not set, the write or 25lc30 functions are executed at the actual memory location.

25AA320/25LC320/25C320 PDF Datasheet浏览和下载

Mainly two types of serial communication protocols are available: It’s memory is organized as pages of bytes each. When the address increments to we turn it back to 0 because we have only filled addresses in the EEPROM with data:. If you are uncertain about support for a specific part, please don’t hesitate to contact us by phone or email. Opcodes are control commands:. Additional information about this technology family.


It can only be written bytes at a time, but it can be read bytes at a time. Next is a short recap of the chip properties. These modes control whether data is shifted in and out on the rising or falling edge of the data clock signal, and whether the daatsheet is idle when high or low.

These parts are always in plastic cases because the erasing of the part is done electrically without the need to expose the internal chip to ultraviolet light. We will walk through the code in small sections.

The CORE part number is easily identified and has been hi-lited. This way if our data comes out looking funny later on we can tell dahasheet isn’t just the serial port acting up:.