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5.内部RAM的数目随机存贮器是任一微处理机系统所必不可少的部分,它在系统中的用途总的来说都是存放要变动的数据。但根据用途的不同基本上分两类,一类是系统自身用的,如堆栈,工作寄存器组,手动(如通过键盘)输入的数据暂存区等。这一类RAM需用的数量不多;另一类是存放从外部采集来的数据。后一类RAM一般数量比较大,如要保存一秒钟以一千赫频率采样的心电信号,就需要有1K字节的RAM。一般在单片机和最小系统中内部的RAM数是不多的,例如8748为64字节,8749为128字节,8751也是128字节,8155中为256宁
5. The number of internal RAM RAM is an essential part of any microprocessor system, its use in the system are generally stored to change the data. But basically divided into two categories according to different purposes, one is the system itself, such as the stack, the working register group, manually (such as through the keyboard) to enter the data temporary storage area. This type of RAM requires a small number of applications; the other is to store data collected from the outside. The latter type of RAM is generally relatively large in number and requires 1 Kbytes of RAM to store the ECG sampled at a frequency of one kHz for one second. Generally in the microcontroller and the smallest system internal RAM is not much, for example, 8748 is 64 bytes, 8749 is 128 bytes, 8751 is 128 bytes, 8155 is 256 Ning