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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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HDLA-2416 Datenblatt(PDF) 7 Page - Agilent(Hewlett-Packard) |
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HDLA-2416 Datenblatt(HTML) 7 Page - Agilent(Hewlett-Packard) |
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7 / 12 page  7 Display Internal Block Diagram Figure 1 shows the HDLX-2416 display internal block diagram. The CMOS IC consists of a 4 x 7 Character RAM, a 2 x 4 Attribute RAM, a 5 bit Control Register, a 128 character ASCII decoder and the refresh circuitry necessary to synchronize the decoding and driving of four 5 x 7 dot matrix displays. Four 7 bit ASCII words are stored in the Character RAM. The IC reads the ASCII data and decodes it via the 128 character ASCII decoder. The ASCII decoder includes the 64 character set of the HPDL-2416, 32 lower case ASCII symbols, and 32 foreign language symbols. A 5 bit word is stored in the Control Register. Three fields within the Control Register provide an 8 level brightness control, master blank, and ex- tended functions disable. For each display digit location, two bits are stored in the Attribute RAM. One bit is used to enable a cursor character at each digit location. A second bit is used to individually disable the blanking features at each digit location. The display is blanked and dimmed through an internal blanking input on the row drivers. Logic within the IC allows the user to dim the display either through the BL input or through the brightness control in the control register. Similarly the display can be blanked through the BL input, the Master Blank in the Control Register, or the Digit Blank Disable in the Attribute RAM. Electrical Description Pin Function Description Chip Enable CE 1 and CE 2 must be a logic 0 to write to the (CE 1 and CE 2 , display. pins 1 and 2) Clear When CLR is a logic 0 the ASCII RAM is reset (CLR, pin 3) to 20hex (space) and the Control Register/ Attribute RAM is reset to 00hex. Cursor Enable CUE determines whether the IC displays the (CUE pin 4) ASCII or the Cursor memory. (1 = Cursor, 0 = ASCII). Cursor Select CU determines whether data is stored in the (CU, pin 5) ASCII RAM or the Attribute RAM/Control Register. (1 = ASCII, 0 = Attribute RAM/Control Register). Write WR must be a logic 0 to store data in the (WR, pin 6) display. Address A 0 -A 1 selects a specific location in the display Inputs memory. Address 00 accesses the far right (A 1 and A 0 , display location. Address 11 accesses the far pins 8 and 7) left location. Data Inputs D 0 -D 6 are used to specify the input data for the (D 0 -D 6 , display. pins 11-17) V DD V DD is the positive power supply input. (pin 9) GND GND is the display ground. (pin 10) Blanking BL is used to flash the display, blank the Input display or to dim the display. (BL, pin 18) |
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