Unfortunately, Mask ROM was expensive and took a long time to produce because each new program required a brand new device to be manufactured by a foundry.
Mask ROM had to be programmed by the manufacturer and was thereafter not alterable. This meant, however, that you couldn't just move a couple of diodes around with a soldering iron and reprogram it. Mask ROM was a lot like Diode Matrix ROM only it was implemented on a much smaller scale. This gave way to Mask ROM with the advent of integrated circuits. This was memory made up of discrete semiconductor diodes placed on a specially organised PCB. The pins on the 24LC512 are pretty straight-forward and consist of power(8), GND(4), write protection(7), SCL/SDA(6, 5), and three address pins(1, 2, 3).Įarly "Stored-Program" type computers - such as desk calculators and keyboard interpreters - began using ROM in the form of Diode Matrix ROM. The Microchip 24LC2512 chip can be purchased in a 8 pin DIP package.
#Wire library memory serial#
Serial EEPROM devices like the Microchip 24-series EEPROM allow you to add more memory to any device that can speak I☬. In most other kinds of non-volatile memory, this can't be done. Sign up today and get $8 off on your first order.ĮEPROM is also very efficient in that individual bytes in a traditional EEPROM can be independently read, erased, and rewritten. LCSC has a strong commitment to offering a wide selection of genuine, high quality electronic components at best price with a global shipping network to over 200 countries. I have been using electronic components from. This is how most consumer electronic devices work. This means you can turn off a device, keep it off for 3 days, and come back and turn it on and it can still run the program that was programmed in it.
So basically, the EEPROM stores and runs a program no matter what. So when you power off the board and then power it back on, the program that was written to the EEPROM can be run. This means that even when the board is powered off, the EEPROM chip still retains the program that was written to it. EEPROM stands for E lectrically E rasable P rogrammable R ead- O nly M emory.ĮEPROM is very important and useful because it is a non-volatile form of memory.