INSIDE THE
COMPUTER
Inside CPUs
􀂉 Registers
􀂾 The CPU uses registers to store
information temporarily
􀂃 Values to be processed
􀂃 Address of value to be fetched from memory
􀂾 In general, the more and bigger the
registers, the better the CPU
􀂃 Registers can be 8-, 16-, 32-, or 64-bit
􀂃 The disadvantage of more and bigger registers
is the increased cost of such a CPU

INSIDE THE
COMPUTER
Inside CPUs
(cont’)
Flags ALU
Program Counter
Instruction Register
Instruction decoder,
timing, and control
Register A
Register B
Register C
Register D
Address Bus Control Bus Data Bus
Internal
buses