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Symbol
A
Accumulator
Ai
Bit i of accumulator
X
Index register X
Y
Index register Y
M
Memory
Mi
Bit i of memory
PS
Processor status register
S
Stack Pointer
PC
Program counter
PC
Low-order byte of program counter
L
PC
High-order byte of program counter
H
N
Negative flag
V
Overflow flag
X modified operation mode flag
T
B
Break flag
D
Decimal mode flag
I
Interrupt disable flag
Z
Zero flag
C
Carry flag
#
Immediate mode
$
Hexadecimal
Special page mode
Notes 1: Listed function is when (T) = 0.
When (T) = 1, (M(X)) is entered instead of (A) and the cycle number is increased by 3.
2: Ditto. The cycle number is increased by 2.
3: Ditto. The cycle number is increased by 1.
4: The cycle number is increased by 2 when a branch is occurred.
5: If the STP instruction is disabled the cycle number will be 2 (same in operation as two NOPs).
178
740 Family Machine Language Instruction Table
Means
Symbol
h h
High-order byte of address (0—255)
II
Low-order byte of address (0—255)
z z
Zero page address (0—255)
n n
Date at (0—255)
i
Data at (0—7)
i i i
Data at (0—7)
<B2>
Second byte of instruction
<B3>
Third byte of instruction
R e l
Relative address
B A D R S
Break address
←
Direction of data transfer
( )
Contents of register of memory
+
Add
Subtract
*
Multiplication
÷
Division
∨
Logical OR
Logical AND
∀
Logical Exclusive OR
Negative
Stable flag after execution
Variable flag after execution
Means
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