“BIT”:位测试累加器A或B的各位跟一个存储单元的各对应位相“与”,用于使条件码寄存器中的N和Z置位或复位(V总是复位的;其它的条件码不变)。累加器A、B或存储单元的内容均不变。BIT指令常用于分支指令之前,以测定允许该分支出现的条件。 “BIT”: Bit Test The bits of the accumulator A or B are ANDed with the corresponding bits of a memory location for setting or resetting N and Z in the condition code register (V is always reset; other conditions The same code). The contents of accumulator A, B, or memory location are unchanged. The BIT instruction is often used before the branch instruction to determine the conditions that allow the branch to occur.