Microprocessor User's Manual

INSTRUCTION SET OPCODES AND CLOCK CYCLES
D-14
87 1000 0111 mod reg r/m (disp-lo),(disp-hi) xchg reg16,reg16/mem16
88 1000 0100 mod reg r/m (disp-lo),(disp-hi) mov reg8/mem8,reg8
89 1000 1001 mod reg r/m (disp-lo),(disp-hi) mov reg16/mem16,reg16
8A 1000 1010 mod reg r/m (disp-lo),(disp-hi) mov reg8,reg8/mem8
8B 1000 1011 mod reg r/m (disp-lo),(disp-hi) mov reg16,reg16/mem16
8C 1000 1100 mod OSR r/m (disp-lo),(disp-hi) mov reg16/mem16,SEGREG
mod 1 - r/m —
8D 1000 1101 mod reg r/m (disp-lo),(disp-hi) lea reg16,mem16
8E 1000 1110 mod OSR r/m (disp-lo),(disp-hi) mov SEGREG,reg16/mem16
mod 1 - r/m —
8F 1000 1111 pop mem16
90 1001 0000 nop (xchg AX,AX)
91 1001 0001 xchg AX,CX
92 1001 0010 xchg AX,DX
93 1001 0011 xchg AX,BX
94 1001 0100 xchg AX,SP
95 1001 0101 xchg AX,BP
96 1001 0110 xchg AX,SI
97 1001 0111 xchg AX,DI
98 1001 1000 cbw
99 1001 1001 cwd
9A 1001 1010 disp-lo disp-hi,seg-lo,seg-hi call far-proc
9B 1001 1011 wait
9C 1001 1100 pushf
9D 1001 1101 popf
9E 1001 1110 sahf
9F 1001 1111 lahf
A0 1010 0000 addr-lo addr-hi mov AL,mem8
A1 1010 0001 addr-lo addr-hi mov AX,mem16
A2 1010 0010 addr-lo addr-hi mov mem8,AL
A3 1010 0011 addr-lo addr-hi mov mem16,AL
A4 1010 0100 movs dest-str8,src-str8
A5 1010 0101 movs dest-str16,src-str16
A6 1010 0110 cmps dest-str8,src-str8
A7 1010 0111 cmps dest-str16,src-str16
A8 1010 1000 data-8 test AL,immed8
A9 1010 1001 data-lo data-hi test AX,immed16
Table D-3. Machine Instruction Decoding Guide (Continued)
Byte 1
Byte 2 Bytes 3–6 ASM-86 Instruction Format
Hex Binary