Intel 8253 - Page 435

4/17/98 6-35 Addressing Modes and Data Types
ADD Rd, #data8
Bytes: 3
Clocks: 3
Operation: (Rd) <-- (Rd) + #data8
Encoding:
byte 3: #data8
ADD Rd, #data16
Bytes: 4
Clocks: 3
Operation: (Rd) <-- (Rd) + #data16
Encoding:
byte 3: upper 8 bits of #data16
byte 4: lower 8 bits of #data16
ADD [Rd], #data8
Bytes: 3
Clocks: 4
Operation: ((WS:Rd)) <-- ((WS:Rd)) + #data8
Encoding:
byte 3: #data8
ADD [Rd], #data16
Bytes: 4
Clocks: 4
Operation: ((WS:Rd)) <-- ((WS:Rd)) + #data16
Encoding:
byte 3: upper 8 bits of #data16
byte 4: lower 8 bits of #data16
1 0 0 1 0 0 0 1 d d d d 0 0 0 0
1 0 0 1 1 0 0 1 d d d d 0 0 0 0
1 0 0 1 0 0 1 0 0 d d d 0 0 0 0
1 0 0 1 1 0 1 0 0 d d d 0 0 0 0