Filter
Top Products
INSTRUCTION SET OPCODES AND CLOCK CYCLES
D-8
PROGRAM TRANSFER INSTRUCTIONS (Continued)
RET = Return from procedure
within segment
1 1 0 0 0 0 1 1 16
within segment adding immed to SP
1 1 0 0 0 0 1 0 data-low data-high 18
intersegment
1 1 0 0 1 0 1 1 22
intersegment adding immed to SP
1 1 0 0 1 0 1 0 data-low data-high 25
JMP = Unconditional jump
short/long
1 1 1 0 1 0 1 1 disp-low 14
direct within segment
1 1 1 0 1 0 0 1 disp-low disp-high 14
reg/memory indirect within segment
1 1 1 1 1 1 1 1 mod 100 r/m 26
indirect intersegment
1 1 1 1 1 1 1 1 mod 101 r/m (mod ?11) 11/17
direct intersegment
1 1 1 0 1 0 1 0 segment offset 14
selector
Iteration Control
LOOP = Loop CX times 1 1 1 0 0 0 1 0 disp 6/16 (2)
LOOPZ/LOOPE =Loop while zero/equal 1 1 1 0 0 0 0 1 disp 5/16 (2)
LOOPNZ/LOOPNE =
Loop while not zero/not equal
1 1 1 0 0 0 0 0 disp 5/16 (2)
JCXZ = Jump if CX = zero 1 1 1 0 0 0 1 1 disp 6/16 (2)
Interrupts
INT = Interrupt
Type specified
1 1 0 0 1 1 0 1 type 47
Type 3
1 1 0 0 1 1 0 0 45
INTO = Interrupt on overflow 1 1 0 0 1 1 1 0 48/4 (3)
BOUND = Detect value out of range 0 1 1 0 0 0 1 0 mod reg r/m 33-35
IRET = Interrupt return 1 1 0 0 1 1 1 1 28
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.