Intel 8253 - Page 481

4/17/98 6-81 Addressing Modes and Data Types
CMP [Rd], Rs
Operation: ((WS:Rd)) - (Rs)
Bytes: 2
Clocks: 4
Encoding:
CMP Rd, [Rs+offset8]
Bytes: 3
Clocks: 6
Operation: (Rd) - ((WS:Rs)+offset8)
Encoding:
byte 3: offset8
CMP [Rd+offset8], Rs
Bytes: 3
Clocks: 6
Operation: ((WS:Rd)+offset8) - (Rs)
Encoding:
byte 3: offset8
CMP Rd, [Rs+offset16]
Bytes: 4
Clocks: 6
Operation: (Rd) - ((WS:Rs)+offset16)
Encoding:
byte 3: upper 8 bits of offset16
byte 4: lower 8 bits of offset16
0 1 0 0 SZ 0 1 0 s s s s 1 d d d
0 1 0 0 SZ 1 0 0 d d d d 0 s s s
0 1 0 0 SZ 1 0 0 s s s s 1 d d d
0 1 0 0 SZ 1 0 1 d d d d 0 s s s