25LC Kbit SPI Bus Serial EEPROM The Microchip Technology Inc. 25AA/25LC *? Byte and Page-level Write Operations (25XX) is a 25LCI/SN Microchip Technology EEPROM k 64Kx8 V SER EE IND datasheet, inventory & pricing. 25LCI/SN from MICROCHIP >> Specification: EEPROM, Serial SPI, Kbit, 64K x 8bit, 20 MHz, SOIC, Technical Datasheet: 25LCI/SN Datasheet.

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Data Sheets

Additionally, I did create a ns and microsecond delay functions I can also test as well, but I’ll try the ms delay with the system tick first. Here is a simple layout of the connections: Usually each bit in a control register effects a particular setting, such as speed or polarity.

It looks like they already have done the heavy lifting for me in regard to setting up the clock and power. Your code seems wrong though, where one reads: I think that would be more convinient. Store the data in ram, till you write it.

Since this is undesirable most of the time, the code below makes the page boundaries transparent for write operations.

If you need larger capacity external memory, something like flash would be more suitable. We will walk through the code in small sections. PIC32 pin 11 25LC pin 1. It can also be used for communication between two microcontrollers.

Data registers simply hold bytes.

SPI and the 25LC EEPROM | M5

You didn’t post your SSP send and receive functions, but that’s probably where your problem is. Control registers code control settings for various microcontroller functionalities. I see what appears to be pulse more like sloped triangles. Very helpful with SPI! Some general point to narrow your error: The first step is setting up our pre-processor directives. Anything above that will make it work just fine.


These modes control whether data is shifted in and out on the rising or falling edge of the data clock signal, and whether the clock is idle when high or low. I have to find out how to use timers as delays, for milliseconds using system tick isn’t going to cut 25lf512.

You have checked that you see a clock.

LPC1764 SPI assistance with 25LC512 EEPROM

It really helped me! CCS does not monitor this forum on a regular basis. This way if our data comes out looking funny later on we can tell it isn’t just the serial port acting up:. Typically there are three lines common to all the devices.

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.

It can only be written bytes at a time, but it can be read bytes at a time.

datashedt Status registers change their state based on various microcontroller conditions. Hi Nick, It seems to me that the ns from the datasheet is the minimum time delay needed for it to work.

All you need is enough hold time on your power supply, to allow a page write to be performed if the incoming power fails. They start with a ” ” and do not end with semi-colons.

If anyone can help me out it would be datasheef appreciated.


Send them to support ccsinfo. When writing to the 25LC, if a single write operation goes beyond the byte page boundary, the write operation will continue at the start of the same page. And, according to this site scroll down to “Timing”: Underneath that they have configured P2.


Also, it is an analog scope, so it is hard to tell the frequency by counting the ticks when the time division can go high enough. My concern is related to your register bit your polling whilst transmitting i. All times are GMT – 6 Hours.

A register is just a byte of microcontroller memory that can be read from or written to. Have you checked if data is sent? This function could easily be changed to fill the array with data relevant to your application:. And the Program for my task is: Instead of a byte by byte insertion on the 25LC,since its write cycles count per page as i understand it There are status bits that can be used to pace the rate at which you feed new data to the SSP.

Arduino Robotics Lonnie Honeycutt. The problem is that I’m not sure if my connections are right or if my software is configured correctly. EEPROM is non-volatile memory usually used to hold small amounts such as system parameters that must be retained between power resets.

Once you have your SPI Control Register set correctly you just need to figure out how long you need to pause between instructions and you are ready to go.