Intel MCS48 User Manual page 90

MCS-48™
INSTRUCTION SET
SYMBOLS AND
ABBREVIATIONS USED
A
Accumulator
AC
Auxiliary Carry
addr
12-Bit
Program
Memory
Address
Bb
Bit
Designator
(b=0-7)
BS
Bank
Switch
BUS
BUS
Port
C
Carry
CLK
Clock
CNT
Event
Counter
CRR
Conversion
Result Register
D Mnemonic
for 4-Bit Digit (Nibble)
data
8-Bit
Number
or
Expression
DBF
Memory Bank
Flip-Flop
FO,
F1 Flag
0,
Flag
1
I
Interrupt
P
Mnemonic
for
"in-page" Operation
PC
Program Counter
Pp
Port
Designator
(p=1,
2 or 4-7)
PSW
Program
Status
Word
Rr
Register
Designator
(r=0,
1
or 0-7)
SP
Stack Pointer
T Timer
TF
Timer
Flag
TO,
T1 Test
0,
Test
1
X
Mnemonic
for
External
RAM
# Immediate Data
Prefix
@
Indirect
Address
Prefix
$
Current Value
of
Program Counter
(X)
Contents
of
X
((X))
Contents
of
Location
Addressed by X
•*-
Is
Replaced by
Mnemonics
copyright
Intel
Corporation 1976.
4-8