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THE SCMP CHIP
SCMP SUPPORT FUNCTIONS
InputOutput Signal Descriptions
4 other sections not shown
16-bit address 16-bit pointer registers AC are lost Accumulator AC address bits address disp ptr address strobe Addressing Modes BIDIRECTIONAL bit position BREQ bus request buses components with suitable contents of AC cross assembler data byte data transfers debug decode DIGIT displacement Effective Address ENIN ENOUT Extension Register Functional Block Diagram hardware Hl-Z indexed addressing initial contents input/output cycle instruction is fetched instruction register interface latched load logic low-order MEMORY ACCESS memory location memory-reference MEMSEL microcycles microprocessor Module order NADS National Semiconductor National Semiconductor Corporation NHOLD NRDS numbers are shown NWDS opcode operand operation Overflow Flag PC-relative addressing peripherals processor program counter Program Counter PC PROM/ROM provides READ ONLY MEMORY read strobe Register is set result is stored SC/MP chip SC/MP Number second byte sense inputs serial input/output shown in figure significant bit Status Register stored in AC subroutine SWITCH UNIDIRECTIONAL BUFFER User Flag VALID WRITE STROBE