Novel Method for Embedded RISC Architecture to Reduce Memory Access Energy

In embedded system, reducing program size is an important goal, because storing large size codes in a smaller memory is a problem. More than one application in one embedded system has large size codes. In order to program the device efficiently, the memory size must be large enough to accommodate the large size codes. For example, PIC16F84 microcontroller has lower memory than PIC16F877 microcontroller. So the PIC16F84 must be replaced with new PIC16F877, in order to get multiple applications. But replacing the existing device with new device or component is not so easy. In this proposed system, the existing system problems must be overcome to improve the efficiency. A way to achieve this is to restrict the size of the instructions. Shorter the instructions are obtained mainly by restricting the number of bits that encode registers. This is achieved by means of compressing the repeated instructions. While executing the codes the instructions are decompressed. This method increases the efficiency of the system and also reduces the energy.