JNB指代两种情况:
第一种:51单片机中
The JNB instruction branches to the specified address if the specified bit operand has a value of 0. Otherwise, execution continues with the next instruction. No flags are affected by this instruction.{引用于:网页链接} 如果条件为0则跳转
第二种:win32汇编
无符号不小于则跳转,即条件>=则跳转