1989_MELPS_7700_Software_Manual

Instructions
The table below lists the symbols that are used in this section:
Symbol
C
Z
I
o
x
m
V
N
IPL
+
x
I
A
V
V
H
Acc
ACCH
ACCl
A
AH
Al
B
BH
Bl
X
XH
Xl
Y
YH
Yl
S
PC
PCH
PCl
REL
PG
OT
Description
Carry flag
Zero flag
Interrupt disable flag
Decimal operation mode flag
Index register length selection flag
Data length selection flag
Overflow flag
Negative flag
Processor interrupt priority level
Addition
Subtraction
Multiplication
Division
Logical AND
Logical OR
Exclusive OR
Negation
Movement to the arrow direction
Movement to the arrow direction
Movement to the arrow direction
Accumulator
Accumulator's upper 8 bits
Accumulator's lower 8 bits
Accumulator A
Accumulator A's upper 8 bits
Accumulator A's lower 8 bits
Accumulator S
Accumulator S's upper 8 bits
Accumulator S's lower 8 bits
Index register X
Index register X's upper 8 bits
Index register X's lower 8 bits
Index register V
Index register V's upper a bits
Index register V's lower 8 bits
Stack pointer
Program counter
Program counter's upper 8 bits
Program counter's lower 8 bits
Relative address
Program bank register
Data bank register
Symbol
Description
OPR Direct page register
OPRH Direct page register's upper 8 bits
OPRl Direct page register's lower 8 bits
PS Processor status register
PSH Processor status register's upper 8 bits
PSl Processor status register's lower 8 bits
PSn Processor status register's n-th bit
M Memory contents
M(n) Contents of memory location specified by
operand
M(S) Contents of memory at address indicated
by stack pointer
Mn n-th memory location
AOG Value of 24-bit address' upper 8-bit
(A23-A1s)
AOH Value of 24-bit address' middle 8-bit
(A15-As)
Value of 24-bit address'lower 8-bit (A7-Ao)
bn n-th bit of data
dd 8-bit offset value
i Number of transfer bytes or rotation
h, i2 Number of registers pushed or pulled
imm 8-bit immediate value
imm1, Imm2 16-bit immediate value (imm1 specifies the
upper 8-bit,and imm2 specifies the lower 8-
bit)
" 8-bit address value
mmll 16-bit address value (mm specifies the
upper 8-bit and II specifies the lower a-bit)
hhmmll 24-bit address value (hh specifies the upper
8-bit, mm specifies the middle 8-bit and
II specifies the lower 8-bit)
nn 8-bit data value
n1, n2 8-bit data value (Used when coding two 8-
bit data side by side)
rr Signed 8-bit data value
mrr2 Signed 16-bit data value (rr1 is the upper 8-
bit value, and rr2 is the lower 8-bit value)
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