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ACIA Asynchronous Communications Interface Adapter
Binary Arithmetic and Logical
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101 register 110 register number 16 bits 32 bits Address Register Indirect Addressing Mode Mode arithmetic ASCII Assembler Syntax assembly language binary branch byte chip circuits Cleared otherwise complement condition codes contents Courtesy of Motorola d(An data register debugging destination location device digits displacement Effective Address Mode error example FF FF FF floating-point hardware hexadecimal index register indicates Instruction Execution Instruction Format integer interface interrupt interrupt request length longword LOOP machine language MACSBUG MC68000 instructions memory locations microcomputer microprocessors Mode Mode Register modules Motorola MOVE instruction MOVE.W negative notation operand operating system peripheral postincrement predecrement processor program counter register direct register number d(PC representation result routine shown in Figure signal lines signed integers source operand specified stack pointer status register stored subroutine supervisor mode tion transfer TRAP two's complement two's-complement unsigned user mode vector word zero