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HPDL1414 Datasheet(PDF) 7 Page - Agilent(Hewlett-Packard) |
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HPDL1414 Datasheet(HTML) 7 Page - Agilent(Hewlett-Packard) |
7 / 12 page ![]() 3-181 Electrical Description Display Internal Block Diagram HPDL-1414 Figure 1 shows the internal block diagram of the HPDL-1414. It consists of two parts: the display LEDs and the CMOS IC. The CMOS IC consists of a four-word ASCII memory, a 64-word charac- ter generator, 17 segment drivers, four digit drivers, and the scanning circuitry necessary to multiplex the four monolithic LED characters. In normal operation, the divide-by-four counter sequentially accesses each of the four RAM locations and simultaneously enables the appropriate display digit driver. The output of the RAM is decoded by the character generator which, in turn, enables the appropriate display segment drivers. Seven- bit ASCII data is stored in RAM. Since the display uses a 64- character decoder, half of the possible 128 input combinations are invalid. For each display location where D5 = D6 in the ASCII RAM, the display character is blanked. Data Entry HPDL-1414 Figure 2 shows a truth table for the HPDL-1414. Data is loaded into the display through the DATA inputs (D6-D0), ADDRESS inputs (A1-A0), and WRITE (WR). After a character has been written to memory, the IC decodes the ASCII data, drives the display and refreshes it without any external hardware or software. Figure 1. HPDL-1414 Internal Block Diagram. |
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Similar Description - HPDL1414 |
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