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代码说明：

说明：   1、 设有一个起始地址为FRIST + 1的数据块，存放在内部RAM， 数据块长度在FRIST单元且不为0，要求统计该数据块中值为0的个数， 并将它们分别存放在FRIST - 1单元单元，试编写出相应程序。(1, with a starting address FRIST+ 1 block of data stored in internal RAM, the data block length of 0 in the FRIST unit and not to require statistical data block 0 in the number of them were stored In FRIST- 1 unit cell, try to write the corresponding program.)