12_BITS_ON_8_BIT_BUS

Published:2009/7/6 21:28:00 Author:May | From:SeekIC

Arrangement shown speeds reading of 12 bits of data onto 8-bit microprocessor bus by simplifying checking procedure. Output of 74C107 flip-flop becomes DATA INVALID bit and is placed on bus during second read cycle. Simultaneously, circuit pulls 3 remaining bits (D4-D6) low through use of spare 8T97 gates. Article gives simplified 8080 subroutine required.-D. W. Taylor, Speed-Read 12 Bits onto an 8-Bit Bus, EDN Magazine, Sept. 5, 1978, p 70.



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