The GM-180C is an 8-character alphanumeric LED display module which provides all the circuitry required to interface a microprocessor or digital system. It is primarily intended for use in microprocessor systems, where it minimizes hardware and software overhead. Incorporated on-chip are a 64-character ASCII decode, 8 x 6 memory, and the multiplex scan circuitry. 6-bit ASCII data to be displayed is written into the memory directly from the microprocessor data bus. Data location depends upon the selection of either Serial (MODE=1) or Random (MODE=0). In the Serial Access mode the first entry is stored in the lowest location and displayed in the "left-most" character position .Each subsequent entry is automatically stored in the next higher location and display to the immediate "right" of the previous entry. A DISPLAY FULL signal is provided after 8 entries; this signal can be used for cascading. A CLEAR pin is provided to clear the memory and reset the location counter. The Random Access mode allows the processor to select the memory address and display digit for each input word. The character multiplex scan runs whenever data is not being entered. It scans the memory and CHARACTER drivers, and ensures that the memory to display is done in the proper sequence. Inter character blanking is provided to avoid display ghosting.