flip-flops are limited because they can store only one bit. a register is an extension of a flip-flop that can store multiple bits. 4-bit register (Reg-4) this register uses D flip-flops all the flip-flops share a common CLK and CLR signal >clock gating when LD = 0, the flip-flop C inputs are held at 1. no positive clock edge -> flip flops keep their current values when LD = 1, the CLK input pas..