progMem

progMem is a term that refers to programmable memory. This type of memory can have its contents altered after it has been manufactured, distinguishing it from mask ROM (Read-Only Memory). Programmable memory is a broad category that encompasses several technologies, each with its own characteristics and applications.

One of the most common forms of progMem is Flash memory. Flash memory is a non-volatile storage medium, meaning it retains its data even when the power is turned off. It is widely used in solid-state drives (SSDs), USB flash drives, memory cards, and within embedded systems for storing firmware. Flash memory allows for data to be erased and reprogrammed in blocks.

Another type of programmable memory is EEPROM (Electrically Erasable Programmable Read-Only Memory). EEPROM also offers non-volatility but typically allows for data to be erased and reprogrammed byte by byte, offering finer granularity than Flash memory. This makes it suitable for storing small amounts of configuration data or parameters that need occasional updates, such as in microcontrollers.

The term progMem is often used in the context of hardware design and embedded systems development. Engineers utilize progMem to store the operating instructions (firmware) for microcontrollers, FPGAs (Field-Programmable Gate Arrays), and other integrated circuits. The ability to reprogram this memory is crucial for updating software, fixing bugs, or reconfiguring the functionality of a device without needing to replace the physical hardware. The specific type of progMem chosen for an application depends on factors such as cost, speed, endurance (how many write/erase cycles it can withstand), and power consumption requirements.