Table of Contents
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Instruction Formats and Number of Execution States
Addressing
mode
Mnem.
Immediate
ADD.B
Register direct
ADD.B
The parts of the table are explained below.
Name: The full and mnemonic names of the instruction are given at the top of the page.
Operation:
The instruction is described in symbolic notation. The following symbols are
used.
Symbol
Meaning
Rd
General register (destination)*
Rs
General register (source)*
Rn
General register*
<EAd>
Destination operand
<EAs>
Source operand
PC
Program counter
SP
Stack pointer
CCR
Condition code register
N
N (negative) flag of CCR
Z
Z (zero) flag of CCR
V
V (overflow) flag of CCR
C
C (carry) flag of CCR
disp
Displacement
→
Transfer from left operand to right operand; or state transition from left
state to right state.
+
Addition
-
Subtraction
×
Multiplication
÷
Division
∧
AND logical
∨
OR logical
⊕
Exclusive OR logical
¬
32
Instruction code
Operands 1st byte
#xx:8, Rd
8
rd
Rs, Rd
0
8
2nd byte 3rd byte 4th byte No. of states
IMM
rs
rd
2
2
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