程序对片内数据存储器(4K RAM)实现读/写操作，先在地址//0000---00FFH写入数据，再读出进行比较是否正确,若不正确蜂鸣器响一声-Procedures on-chip data memory (4K RAM) to achieve read/write operation, first in the address// 0000--- 00FFH write data, read out the comparison is correct, do not say the right ring buzzer