以上的数字为操作码。 在只读寄存器中，这段小程序看上去应该象下面这样。
The numbers are known as opcodes. In ROM, our little program would look like this.
家族代码显示在SAP（伺服适配参数）控制编辑寄存器而编辑在RAM（随机存储）和ROM（只读存储）。
Family code is displayed in SAP Control Flags editor while editing in RAM and ROM.
本寄存器是只读的，被用来标识该设备类属的功能，而且在有些情况下，是一个寄存器级的编程接口。
Class Code the Class Code register is read-only and is used to identify the generic function of the device and, in some cases, a specific register-level programming interface.
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