A02- Fetch, Execution and IO
CPU (Central Processing Unit), also called the Processor is the "heart" of the computer. Data is stored in Bits. One byte is equal to 8 bits. A bit can be either 0 or 1. A pulse of 5 volt of electricity can represent 1 bit and a pulse of 0 volt can represent 0 bit. With fiber optic cable, 1 bit is represented by the presence of light and 0 by the absence of light. ASCII- American Standard Code for Information Interchange Functional Units Organized into words of typically 32 bits which contains 4 bytes. Cache Memory Adjunct to the main memory Much smaller and faster than the main memory Holds section of the data currently being executed. Processor Logic circuits for performing arithmetic and logic operations. Timing and control Circuits for fetching program instructions and data from main memory, one after another Registers (16 or 32), each of which hold one word of operand data sections of the program and data currently being executed. Processor Arithmetic and Logic Unit Mos...