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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It can also be used for communication between two microcontrollers. 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.

Arduinoos » Blog Archive » Memory (Part 3)

We satasheet the setup function by sending the word “hi” plus a line feed out the built in serial port for debugging purposes. Instructions are sent as 8 bit operational codes opcodes and are shifted in on the rising edge of the data clock.

My preference goes to SPI in spite of the highest number of pin required. Each time through the loop we increment the eeprom address to read. An explanation of bit masks can be found here. Microcontrollers are usually found in products which perform a single function such as microwave ovens, computer printers, automatic sprinkler controllers, etc. Memory Part 3 Posted on 31 Jan A register is just a byte of microcontroller memory that can be read from or written to. Coming next after the 25LC chips are the 25AA chips.

You must be logged in to post a comment. Registers generally serve three purposes, control, data and status.

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

The example below describes how to determine a typical core part number. This way if our data comes out looking funny later on we can tell it isn’t just the serial port acting up:.


They differ from their supply voltages: In absolute, SPI is faster and I use this protocol a lot in my applications.

Dztasheet start with a ” ” and do not end with semi-colons. These parts must be erased before programming. A microcontroller normally has 40 or more pins since the input and output operations occur directly from the chip.

Leave a Reply Click here to cancel reply. Most devices, regardless of the technology family, can be identified by their CORE part number. The listed device numbers conform to the core numbers used by most industry standard parts.

We send the 16 bit address to begin writing at in two bytes, Most Significant Bit first. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count. Care shall be taken at the B versions which have a different meaning! Additional information about this technology family. In the control register each bit sets a different functionality. Usually each bit in a control register effects a particular setting, such as speed or polarity.

The CORE part number is easily identified and has been hi-lited. Although not as fast, serial eeproms and nvrams find use in many products due to their dattasheet size and low cost. In other words, you may read carefully the chip data sheets before trying to tweak the proposed code. The RAM would normally lose its contents when power is removed, however the NVRAM is manufactured with a built in battery which keeps power applied to the memory after power has been removed from the product.

The difficult part about SPI is that the standard is loose and each device implements it a little differently. Bug of the day: When the address increments to we turn it back to 0 because we have only filled addresses in the Dataxheet with data:.

Data Sheets

This approach allows you to more easily locate a dataseet number, as many users do not know the manufacturer of the device in which they have interest.


It’s memory is organized as pages of bytes each. Pre-processor directives are processed before the actual compilation begins. Both have there advantages and draw backs. Data registers simply hold bytes. With an SPI connection there is always one master device usually a microcontroller which controls the peripheral devices.

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. Since the individual listing of every part number from every manufacturer 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.

Next is a 2l5c320 recap of the chip properties. The NV stands for non-volatile. This function could easily be changed to fill the array with data relevant to your application:. Serial Peripheral Interface SPI is a synchronous serial data protocol used by Microcontrollers for communicating with one or more peripheral devices quickly over short distances. The CORE part number for each device is Each has the manufacturers full part number printed on the device.

Once they are programmed they cannot be changed. The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers.

Remember, a core part number usually represents hundreds of actual part numbers due to different manufacturers, speeds, temperatures, package types and other chip characteristics. 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.