拆字5.试编写一拆字子程序，将累加器A中的高、低四位分开，分别对应放到31H单元、30H单元的低四位中，并将31H单元、30H单元的高四位全部补0。

6.试编写一拼字子程序，将外部RAM中3001H单元、3000H单元的低四位组成一个新的字节，存储到内部数据存储器32H单元中。

-拆字5.拆字try to prepare a subroutine, the accumulator A of the high and low four separate, corresponding on the 31H unit, 30H low unit 4, and will 31H unit, 30H all four units high fill 0. 6. Try to prepare a spelling subprogram, external RAM in 3001H unit, 3000H low unit formation of a new four-byte internal data memory storage unit 32H.