A capability of accessing information quickly from storage unit or register. The zero access generally refers to as the parallel access, and it need not wait for access of other information. The register inside APU is generally a zero access register.

• 从存储单元或寄存器快速地存取信息的能力。立即存取一般指并行存取，不须要等待别的信息存取后再进行。在运算器中的寄存器一般为立即存取寄存器。