Section 7.6: Example of control points and the fetch/decode/execute cycle (Frame 2)                     [prev][home][next]

  1. The beginning of the cycle, PC has the address 257. Memory word 257 contains a bit pattern that we can interpret as ADD 3170. The bit pattern is actually 0011110001100010. The first four bits 0011 are the ADD instruction, while 110001100010 is the binary number 3170.