编写程序，统计以下字符串“Intel's original 8051 family was developed using NMOS technology, but later versions, identified by a letter C in their name (e.g., 80C51) used CMOS technology and were less power-hungry than their NMOS predecessors. This made them more suitable for battery-powered devices.”中每个英文字符（不区分大小写）和不同标点符号（包括空格）出现的次数。字符串存放于 2000H开始的程序空间，统计值保存在0040H开始的片外RAM中，0040H-0059H顺序存放a-z的出现次数，005AH开始存放标点符号的出现次数，存放顺序自行定义（考虑各种标点符号）。 2000H开始的程序空间，统计值保存在0040H开始的片外RAM中，0040H-0059H顺序存放a-z的出现次数，005AH开始存放标点符号的出现次数，存放顺序自行定义（考虑各种标点符号）。