This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The collective microprograms in a CPU, used to run machine instructions.

n. (computer science) coded instructions that are stored permanently in read-only memory

"It claims the manufacturer infringes copyrights Microchip holds for the "microcode" used in some of its older integrated circuits."

computer code    code   

table-driven    marketshare    self-check    full-up    operand