CS80C88 datasheet(32/32 Pages) INTERSIL

32 / 32 page

3-32

NOTES:

AL = 8-bit accumulator

AX = 16-bit accumulator

CX = Count register

DS= Data segment

ES = Extra segment

Above/below refers to unsigned value.

Greater = more positive;

Less = less positive (more negative) signed values

if d = 1 then “to” reg; if d = 0 then “from” reg

if w = 1 then word instruction; if w = 0 then byte

instruction

if mod = 11 then r/m is treated as a REG ﬁeld

if mod = 00 then DISP = 0†, disp-low and disp-high

are absent

if mod = 01 then DISP = disp-low sign-extended

16-bits, disp-high is absent

if mod = 10 then DISP = disp-high:disp-low

if r/m = 000 then EA = (BX) + (SI) + DISP

if r/m = 001 then EA = (BX) + (DI) + DISP

if r/m = 010 then EA = (BP) + (SI) + DISP

if r/m = 011 then EA = (BP) + (DI) + DISP

if r/m = 100 then EA = (SI) + DISP

if r/m = 101 then EA = (DI) + DISP

if r/m = 110 then EA = (BP) + DISP †

if r/m = 111 then EA = (BX) + DISP

DISP follows 2nd byte of instruction (before data

if required)

†

except if mod = 00 and r/m = 110 then

EA = disp-high: disp-low.

†† MOV CS, REG/MEMORY not allowed.

if s:w = 01 then 16-bits of immediate data form the operand.

if s:w = 11 then an immediate data byte is sign extended

to form the 16-bit operand.

if v = 0 then “count” = 1; if v = 1 then “count” in (CL)

x = don't care

z is used for string primitives for comparison with ZF FLAG.

SEGMENT OVERRIDE PREFIX

001 reg 11 0

REG is assigned according to the following table:

16-BIT (w = 1)

8-BIT (w = 0)

SEGMENT

000 AX

000 AL

00 ES

001 CX

001 CL

01 CS

010 DX

010 DL

10 SS

011 BX

011 BL

11 DS

100 SP

100 AH

101 BP

101 CH

110 SI

110 DH

111 DI

111 BH

Instructions which reference the flag register file as a 16-bit

object use the symbol FLAGS to represent the file:

FLAGS =

X:X:X:X:(OF):(DF):(IF):(TF):(SF):(ZF):X:(AF):X:(PF):X:(CF)

Mnemonics

Instruction Set Summary (Continued)

MNEMONIC AND DESCRIPTION

INSTRUCTION CODE

7 6 5 4 3 2 1 0

80C88

CS80C88 Datasheet(PDF) 32 Page - Intersil Corporation

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