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INSTRUCTION SET OPCODES AND CLOCK CYCLES
D-6
BIT MANIPULATION INSTRUCTIONS (Continued)
TEST= And function to flags, no result
register/memory and register
1 0 0 0 0 1 0 w mod reg r/m 3/10
immediate data and register/memory
1 1 1 1 0 1 1 w mod 000 r/m data data if w=1 4/10
immediate data and accumulator
1 0 1 0 1 0 0 w data data if w=1 3/4 (1)
Shifts/Rotates
register/memory by 1
1 1 0 1 0 0 0 w mod TTT r/m 2/15
register/memory by CL
1 1 0 1 0 0 1 w mod TTT r/m 5+n/17+n
register/memory by Count
1 1 0 0 0 0 0 w mod TTT r/m count 5+n/17+n
STRING MANIPULATION INSTRUCTIONS
MOVS = Move byte/word 1 0 1 0 0 1 0 w 14
INS = Input byte/word from DX port 0 1 1 0 1 1 0 w 14
OUTS = Output byte/word to DX port 0 1 1 0 1 1 1 w 14
CMPS = Compare byte/word 1 0 1 0 0 1 1 w 22
SCAS = Scan byte/word 1 0 1 0 1 1 1 w 15
STRING MANIPULATION INSTRUCTIONS (Continued)
LODS = Load byte/word to AL/AX 1 0 1 0 1 1 0 w 12
STOS = Store byte/word from AL/AX 1 0 1 0 1 0 1 w 10
Repeated by count in CX:
MOVS = Move byte/word 1 1 1 1 0 0 1 0 1 0 1 0 0 1 0 w 8+8n
INS = Input byte/word from DX port 1 1 1 1 0 0 1 0 0 1 1 0 1 1 0 w 8-8n
OUTS = Output byte/word to DX port 1 1 1 1 0 0 1 0 0 1 1 0 1 1 1 w 8+8n
CMPS = Compare byte/word 1 1 1 1 0 0 1 z 1 0 1 0 0 1 1 w 5+22n
SCAS = Scan byte/word 1 1 1 1 0 0 1 z 1 0 1 0 1 1 1 w 5+15n
LODS = Load byte/word to AL/AX 1 1 1 1 0 0 1 0 0 1 0 1 0 0 1 w 6+11n
STOS = Store byte/word from AL/AX 1 1 1 1 0 1 0 0 0 1 0 1 0 0 1 w 6+9n
Table D-2. Instruction Set Summary (Continued)
Function Format Clocks Notes
NOTES:
1. Clock cycles are given for 8-bit/16-bit operations.
2. Clock cycles are given for jump not taken/jump taken.
3. Clock cycles are given for interrupt taken/interrupt not taken.
4. If TEST
= 0
Shading indicates additions and enhancements to the 8086/8088 instruction set. See Appendix A, “80C186
Instruction Set Additions and Extensions,” for details.