UNIVERSAL_KEYBOARD_ENCODER

Published:2009/7/11 3:52:00 Author:May | From:SeekIC

Harris HD-0165 keyboard encoders are combined with three read-only memories wired in parallel to generate universal code that can be translated to desired output code by using suitable electric programming of ROMs. Key-to-encoder wiring is arbitrary as long as each key operation produces unique 6-bit output code from encoders.One ROM is programmed to contain all 64 output words for unshifted mode, second for shifted mode, and third ROM contains all words for control mode.- Linear & Data Acquisition Products, Harris Semiconductor, Melbourne, FL, Vol. 1, 1977, p 7-2-7-B (Application Note 204).



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