IA6805E2 Datasheet, PDF (19/31 Pages) InnovASIC, Inc – Microprocessor Unit

IA6805E2
Microprocessor Unit
Data Sheet
As of Production Version 00
Instruction Set Description
The MPU has 61 basic instructions divided into 5 types. The 5 types are Register/memory, read-
modify-write, branch, bit manipulation, and control.
Register/Memory Instructions:
Most of the following instructions use two operands. One is either the accumulator or the
index register and the other is obtained from memory. The jump unconditional (JMP) and
jump to subroutine (JSR) instructions have no register operand.
Function
Load A from memory
Load X from memory
Store A in memory
Store X in memory
Add memory to A
Add memory and carry to A
Subtract memory
Subtract memory from A with Borrow
AND memory to A
OR memory with A
Exclusive OR memory with A
Arithmetic compare A with memory
Arithmetic compare X with memory
Bit test memory with A (logical compare)
Jump Unconditional
Jump to subroutine
Mnemonic
LDA
LDX
STA
STX
ADD
ADC
SUB
SBC
AND
ORA
EOR
CMP
CPX
BIT
JMP
JSR
Read-Modify-Write Instructions:
These instructions read a memory or register location, modify or test its contents and then
write the modified value back to memory or the register.
Function
Increment
Decrement
Clear
Complement
Negate (2's complement)
Rotate Left Thru Carry
Rotate Right Thru Carry
Logical shift left
Logical shift right
Arithmetic shift right
Test for negative or zero
Copyright © 2002
innovASIC

The End of Obsolescence™
ENG21108140100
Page 19 of 31
Mnemonic
INC
DEC
CLR
COM
NEG
ROL
ROR
LSL
LSR
ASR
TST
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