Title: Electronic calculator or digital processor chip with separately controllable digit and segment outputs

• Summary
• Claims
• Description
• View all

Abstract: An MOS/LSI semiconductor chip for providing the functions of an electronic calculator or digital processor includes a data storage RAM, a ROM for program instruction storage, an arithmetic unit for performing operations on data, and control circuitry for defining the functions of the machine in response to instructions from the ROM as well as conditions in the machine and inputs from external. Input and output terminals are provided, as for keyboard input and display output. The operation is digit oriented in that an instruction accesses one digit of the RAM. One set of output terminals may be used for sequentially scanning the display digits and the keyboard matrix, while another set of output terminals may provide segment outputs to the display. The two sets of output terminals are separately controllable. The terminals going to the display digits can be actuated in any order, not necessarily associated with any particular digit being applied to the segment outputs. The data to both sets is latched, so the machine can execute other instructions while a given output subsists. PRETEXTREPLACED


Do you think this is a good invention? Vote now: