This document discusses microprogrammed control in CPUs. It explains that microprogrammed control uses a control memory to store microinstructions that specify sequences of micro-operations. Each microinstruction is a control word that determines which micro-operations will execute. By sequencing through different microinstructions stored in control memory, the CPU can perform complex instruction sets in a flexible manner compared to hardwired control logic. Advanced microprogrammed CPUs can dynamically load microprograms from auxiliary memory.