Sonic Alert msm85c154hvs, msm83c154s, msm80154s user manual Description of Instruction Symbols

Models: msm83c154s msm85c154hvs msm80154s

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MSM80C154S/83C154S/85C154HVS

7.2 Description of Instruction Symbols

The instruction symbols have the following meanings.

A

Accumulator

AB

Register pair

AC

Auxiliary carry

B

Arithmetic operation register

C

Carry (the bit 7 carry represented by CY is changed to C in Chapter 7.)

DPTR

Data pointer

PC

Program counter

Rr

Register representation (r=0/1, or r=0 thru 7)

SP

Stack pointer

AND

Logical AND

OR

Logical OR

XOR

Exclusive OR

+

Addition

Subtraction

Multiplication

/

Division

(X)Representation of the contents of X

((X))

Representation of the contents addressed by contents of X

#

Symbol denoting immediate data

@Symbol denoting indirect address

=

Equal sign

Not equal

Substitution

Substitution

Negation (upper bar)

<

Smaller than

>

Larger than

bit address

RAM or special function register bit designated address

code address

Absolute address (A0 thru A15, A0 thru A11)

data

Immediate data (I0 thru I7)

relative offset

Corrected relative jump address value

direct address

RAM or special function register data designated address (“direct

 

address” representation changed to “data address” during

 

detailed description of instructions)

232

Page 239
Image 239
Sonic Alert msm85c154hvs, msm83c154s, msm80154s user manual Description of Instruction Symbols