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8-Character, Microprocessor-CompaTIble, LED Display Decoder DriverThe ICM7244 is an 8-character, alphanumeric display driverand controller which provides all the circuitry required tointerface a microprocessor or digital system to a 16-segmentdisplay with internal pull-up resistors. It is primarily intendedfor use in microprocessor systems, where it minimizeshardware and software overhead. Incorporated on-chip are a64-character ASClI decoder, 8 x 6 memory, high powercharacter and segment drivers, and the mulTIplex scancircuitry.6-bit ASCll data to be displayed is written into the memorydirectly from the microprocessor data bus. Data locaTIondepends upon the selecTIon of either Sequential(MODE = 1) or Random access mode (MODE = 0). In theSequential Access mode the first entry is stored in thelowest location and displayed in the “left-most” characterposition. Each subsequent entry is automatically stored inthe next higher location and displayed to the immediate“right” of the previous entry. A DISPlay FULL signal isprovided after 8 entries; this signal can be used forcascading devices together. A CLeaR pin is provided toclear the memory and reset the location counter. TheRandom Access mode allows the processor to select thememory address and display digit for each input word.The character multiplex scan runs whenever data is notbeing entered. It scans the memory and CHARacter drivers,and ensures that the decoding from memory to display isdone in the proper sequence. Intercharacter blanking isprovided to avoid display ghosting.
