Microcode
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In computer architecture, microcode is a layer of low-level control data or instructions used to implement a processor's instruction set architecture or internal control sequences. It consists of hard
The microcode (and "nanocode") of the Motorola 68000 is stored in the two large square blocks in the upper right and controlled by circuitry to the right of it. It takes up a significant amount of the total chip surface.
Firmware
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In computing, firmware is software that provides low-level control of computer hardware. For a relatively simple device, firmware may perform all control, monitoring and data manipulation functionalit
Microcode
…rotate right, rotate right twice, and byte swap. Some hardware vendors, notably IBM and Lenovo, use the term microcode interchangeably with embedded firmware. In this context, all code within a device is termed microcode, whether it is microcode or machine code. For instance, updates to a hard disk drive's…
Firmware is commonly stored in an EEPROM or Flash memory, which makes use of an I/O protocol such as SPI.
ROM BIOS firmware on a Baby AT motherboard
Updating the firmware of a Fuji Instax camera