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学习目标:
内存容量、起始地址或结束地址的计算方法
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学习内容:
内存是按字节编址的,所以单位是字节(byte、bytes),1字节可是等于8位(bit)的。
因为计算的范围一般比较小,所以就记住两个就够了。
记住几个常用的2的10次方为1024即1KB
12bit-->2^12=4096byte、
G代表2^10 x 2^10 x2^10 = 2^30。
公式:
内存容量=末地址-首地址+1
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如何用计算器算:
(1)打开电脑上的计算器
(2)以图片展示
点击左上角的“三”找到程序员(programer)
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学习产出:
以例子为证:
(1)
容量为4K
4K*8bit = 4KB即2的平方乘以2的10次方,2的12次方,12/4=3(转为16进制)即1000H
01000H=末地址-6800H+1H
末地址=01000H+6800H-1H
末地址=077FFH
(2)SRAM起始于20000000H,容量为20kBytes,计算结束地址
20*1024=20480————=5000H
5000H=?-20000000+1
?=20004FFF