Intel 386 User Manual

Page 649

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL

E-12

within segment adding
immed to SP

1 1 0 0 0 0 1 0

16-bit displacement

12 + m

g, h, r

intersegment

1 1 0 0 1 0 1 1

36 + m

g, h, j, k,

intersegment adding
immed to SP

1 1 0 0 1 0 1 0

16-bit displacement

36 + m

g, h, j, k,

Protected mode only (RET):

to different privilege level

Intersegment

h, j, k, r

Intersegment adding immed to SP

h, j, k, r

CONDITIONAL JUMPS
(times are jump “Taken or not Taken”)

JO = jump on overflow

8-bit displacement

0 1 1 1 0 0 0 0

8-bit displacement

7 + m

or 3

7 + m

or 3

Full displacement

0 0 0 0 1 1 1 1

1 0 0 0 0 0 0 0

Full displacement

7 + m

or 3

7 + m

or 3

JNO = Jump on not overflow

8-bit displacement

0 1 1 1 0 0 0 1

8-bit displacement

7 + m

or 3

7 + m

or 3

Full displacement

0 0 0 0 1 1 1 1

1 0 0 0 0 0 0 1

Full displacement

7 + m

or 3

7 + m

or 3

JB/JNAE = jump on below/not above or equal

8-bit displacement

0 1 1 1 0 0 1 0

8-bit displacement

7 + m

or 3

7 + m

or 3

Full displacement

0 0 0 0 1 1 1 1

1 0 0 0 0 0 1 0

Full displacement

7 + m

or 3

7 + m

or 3

JNB/JAE = jump on not below/above or equal

8-bit displacement

0 1 1 1 0 0 1 1

8-bit displacement

7 + m

or 3

7 + m

or 3

Full displacement

0 0 0 0 1 1 1 1

1 0 0 0 0 0 1 1

Full displacement

7 + m

or 3

7 + m

or 3

JE/JZ= jump on equal/zero

8-bit displacement

0 1 1 1 0 1 0 0

8-bit displacement

7 + m

or 3

7 + m

or 3

Full displacement

0 0 0 0 1 1 1 1

1 0 0 0 0 1 0 0

Full displacement

7 + m

or 3

7 + m

or 3

JNE/JNZ = jump on not equal/not zero

8-bit displacement

0 1 1 1 0 1 0 1

8-bit displacement

7 + m

or 3

7 + m

or 3

Table E-1. Instruction Set Summary (Sheet 11 of 19)

Instruction

Format

Clock Count

Notes

Real

Ad-

dress
Mode

Virtual

8086
Mode

Pro-

tected

Virtual

Ad-

dress
Mode

Real

Ad-

dress
Mode

Virtual

8086
Mode

Pro-

tected

Virtual

Ad-

dress
Mode