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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A register is just a byte of microcontroller memory that can be read from or written to.

Microchip Tech 25LCI/SN – PDF Datasheet – EEPROM In Stock |

They differ from their supply voltages: Serial Peripheral Interface SPI is a synchronous serial data protocol 25pc320 by Microcontrollers for communicating with one or more peripheral devices quickly over short distances. Each time through the loop we increment the eeprom address to read. A microcontroller normally has 40 or more pins since the input and output operations occur directly from the chip.

Here we allocate the global variables we will be using later in the program. These parts do not have a battery and maintain their information as an array of magnetic charges.

It can only be written bytes at a time, but it can be read bytes at a time. Each chip has its own properties in terms of: It can also be used for communication between two microcontrollers. The NV stands for non-volatile.

Data Sheets

This means you have to dataasheet special attention to the datasheet when writing your interface code. In this mode, 8 bits arranged memories require 8 pins from the micro-controller which is too much pins consuming even though the gain in speed is noticeable.


Since the individual listing of every part number from every dxtasheet creates a prohibitively large list, we list all supported manufacturers in a separate table with core part numbers arranged by technology family and pin count where applicable. 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.

It’s memory is organized as pages of bytes each. Each has the manufacturers full part number printed on the device. In the main loop it reads that data back out, one byte at a time and prints that byte out the built in serial port. Leave a Reply Click here to cancel reply.

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

Registers generally serve three purposes, control, data and status. Unlike Flash devices, these memory parts can have daasheet bytes changed without the need to erase the entire part.

Mainly two types of serial communication protocols are available: This deselects the device and avoids any false transmission messages due to line noise:.

Coming next after the 25LC chips are the 25AA chips. We add a line feed and a pause for readability.

My preference goes to SPI in spite of the highest number of pin required. This function could easily be changed to fill the array with data relevant to your application:. Bug of the day: The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers. Both have there advantages and draw backs. Note that we use the WREN opcode we defined at the beginning of the program. These memory chips store the bits of data by blowing small vatasheet inside the memory device.


Generally speaking there are three modes of transmission numbered 0 – 3. In the control register each bit sets a different functionality.

25LC Datasheet pdf – – Microchip

Additional information about this technology family. The FRAM is also a non-volatime memory component however it uses ferro-electric magnetic structure to store information. Microcontrollers are usually found in products which perform a single function such as microwave ovens, computer printers, automatic sprinkler controllers, etc. Next is a short recap of the chip properties. In absolute, SPI is faster and I use this protocol a lot in my applications. Most devices, regardless of the technology family, can be identified by their CORE part number.

These parts must be erased before programming. Next post on same subject. Status registers change their state based on various microcontroller conditions. Once they are programmed they cannot be changed. Memory Part 3 Posted on 31 Jan ,