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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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HDLA-3416 Datenblatt(PDF) 9 Page - Agilent(Hewlett-Packard) |
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HDLA-3416 Datenblatt(HTML) 9 Page - Agilent(Hewlett-Packard) |
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9 / 12 page  9 Display Clear Data stored in the Character RAM, Control Register, and Attribute RAM will be cleared if the clear (CLR) is held low for a minimum of 10 µs. Note that the display will be cleared regardless of the state of the chip enables (CE 1, CE2). After the display is cleared, the ASCII code for a space (20hex) is loaded into all character RAM locations and 00hex is loaded into all Attribute RAM/Control Register memory locations. Data Entry Figure 2 shows a truth table for the HDLX-3416 display. Setting the chip enables (CE 1, CE2) to logic 0 and the cursor select (CU) to logic 1 will enable ASCII data loading. When cursor select (CU) is set to logic 0, data will be loaded into the Control Register and Attribute RAM. Address inputs A 0-A1 are used to select the digit location in the display. Data inputs D 0-D6 are used to load information into the display. Data will be latched into the display on the rising edge of the WR signal. D 0-D6, A0-A1, CE1, CE2, and CU must be held stable during the write cycle to ensure that correct data is stored into the display. Data can be loaded into the display in any order. Note that when A 0 and A1 are logic 0, data is stored in the right most display location. Cursor When cursor enable (CUE) is a logic 1, a cursor will be displayed in all digit locations where a logic 1 has been stored in the Digit Cursor memory in the Attribute RAM. The cursor consists of all 35 dots ON at half brightness. A flashing cursor can be displayed by pulsing CUE. When CUE is a logic 0, the ASCII data stored in the Character RAM will be dis- played regardless of the Digit Cursor bits. Blanking Blanking of the display is con- trolled through the BL input, the Control Register, and Attribute RAM. The user can achieve a variety of functions by using these controls in different combinations, such as full hardware display blank, software blank, blanking of individual characters, and syn- chronized flashing of individual characters or entire display (by CUE BL CLR CE1 CE2 WR CU A1 A0 D6 D5 D4 D3 D2 D1 D0 Function 01 1 Display ASCII 11 1 Display Stored Cursor XX 0 X X XXX XX XXX X X X Reset RAMs X0 1 Blank Display but do not reset RAMs and Control Register Extended Intensity Master Digit Digit Write to Attribute RAM 0 0 0 Functions Control Blank Blank Cursor and Control Register Disable Disable 0 0 0 = 000 = 100% 0 = Digit Digit DBDn = 0, Allows Digit n to be 0 0 1 Enable 001 = 060% Display Blank Cursor blanked D1-D5 010 = 040% ON Disable 1 1 011 = 027% DBDn = 1 Prevents Digit n X X 1 0 0 0 1 = 100 = 017% 1 = Digit Digit from being blanked. 0 1 0 Disable 101 = 010% Display Blank Cursor D1-D5 110 = 007% Blanked Disable 2 2 DCn = 0 Removes cursor from 111 = 003% Digit n D0 Digit Digit 0 1 1 Always Blank Cursor DCn = 1 Stores cursor at Enabled Disable 3 3 Digit n 1 0 0 Digit 0 ASCII Data (Right Most Character) X X 1 0 0 0 1 0 1 Digit 1 ASCII Data Write to Character RAM 1 1 0 Digit 2 ASCII Data 1 1 1 Digit 3 ASCII Data (Left Most Character) 1X X X X 1 X 1 X X X X X X X X X X X No Change XX 1 0 = Logic 0; 1 = Logic 1; X = Do Not Care Figure 2. Display Truth Table. |
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