Intel 8253 - Page 562

XA User Guide 6-162 4/17/98
SUBB [Rd], Rs
Bytes: 2
Clocks: 4
Operation: ((WS:Rd)) <-- ((WS:Rd)) - (Rs) - (C)
Encoding:
SUBB Rd, [Rs+offset8]
Bytes: 3
Clocks: 6
Operation: (Rd) <-- (Rd) - ((WS:Rs)+offset8) - (C)
Encoding:
byte 3: offset8
SUBB [Rd+offset8], Rs
Bytes: 3
Clocks: 6
Operation: ((WS:Rd)+offset8) <-- ((WS:Rd)+offset8) - (Rs) - (C)
Encoding:
byte 3: offset8
SUBB Rd, [Rs+offset16]
Bytes: 4
Clocks: 6
Operation: (Rd) <-- (Rd) - ((WS:Rs)+offset16) - (C)
Encoding:
byte 3: upper 8 bits of offset16
byte 4: lower 8 bits of offset16
0 0 1 1 SZ 0 1 0 s s s s 1 d d d
0 0 1 1 SZ 1 0 0 d d d d 0 s s s
0 0 1 1 SZ 1 0 0 s s s s 1 d d d
0 0 1 1 SZ 1 0 1 d d d d 0 s s s