Instructions

   

HLT

Ends the program execution. Register and memory values are not changed. After setting the instruction pointer to another address the programm execution can be resumed.

LAD

Loads the accumulator with the operand or the value described by the addressing mode.

SPI

Stores the accumulator to the memory address described by the addressing mode.

ADD

Adds the operand described by the addressing mode to the accumulator. This operation obeys signs. There is no information if an overflow occured.

SUB

Subtracts the operand described by the addressing mode from the accumulator. This operation obeys signs. There is no information if an overflow occured.

MUL

Multiplies the operand with the accumulator and stores the result in the accu. This operation obeys signs. There is no information if an overflow occured.

DIV

Divides the accumulator with the operand and stores the result in the accu. This is an integer division and the remainder is stored in the SWAP Register. This operation obeys signs. There is no information if an overflow occured.

JMP

Jumps to the given address.

JEZ

Jumps to the given address if the accumulator is equal zero.

JGZ

Jumps to the given address if the accumulator is greater or equal zero.

JLZ

Jumps to the given address if the accumulator is lower zero.

SWAP

Swaps the accumulator and the help register.

JSR

Jumps to the given address. The address of the following instruction is pushed on the stack.

RET

Pops an address from the stack and continues the program execution at that address.

The arithmetic instructions always hold their result in the accumulator.

 

• Stackinstructions
  • Arithmetic operations on the stack
• Indexinstructions
• Addressing Modes
• Instructiontable