Basic Microprocessors and the 6800Provides a General Guide to Microprocessors with a Complete Description of the M6800 System |
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2's complement accumulator ACIA ACIAD address bus address specified addressing mode assembler binary number branch instruction chip select circuit cleared otherwise clock code register bits condition code register control register convert CS2 CS1 data bus data direction register data lines device eight-bit EXECUTE THIS INSTRUCTION Execution Time Cycles flowchart follows gate goes low hex address index register Instruction Code Hex interrupt flag IRQA IRQB machine language MEMORY ADDRESS CONTENTS memory location microprocessor MPU address line MULTIPLICAND Note parity peripheral data register PIA 1 PIA PIA1AC program counter register bits affected register select reset resistor result ROM ADDRESS RS1 RSO shifted shown in Fig signal significant byte Source Listing Example source program specified by index stack pointer stored subroutine subtraction TEMP three-state tied to MPU transistor truth table voltage zero