1.1.1 Structure and function of the processor

1.1.1 Structure and function of the processor

1. Processor components

   • PC
     • current line of code
     • transferred to MAR
   • MAR
     • Memory Address Register
   • MDR
     • Memory Data Register
   • ACC
     • store alu calculations
   • ALU
     • calculations and decisions
   • CIR
     • Current Instruction Register
   • CU
     • Co-ordinate flow of data
   • Buses
     • Address
     • Data
     • Control

2. Fetch, Execute cycle

   • Fetch
     • Gathers the instructions
   • Decode
     • Change to Object code
   • Execute
     • Output information

3. CPU

   • Clock speed
     • Hertz
     • cycles a second
   • Cores
     • Multi tasking
   • Cache
     • Level 1
     • Level 2
     • Level 3
   • RAM
     • instructions
     • volatile
   • ROM
     • Non-volatile