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HPDL1414 Datasheet(PDF) 10 Page - Agilent(Hewlett-Packard) |
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HPDL1414 Datasheet(HTML) 10 Page - Agilent(Hewlett-Packard) |
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10 / 12 page  3-184 Display Clear HPDL-2416 As shown in Figure 4, the ASCII data stored in the display will be cleared if the clear (CLR) is held low and the blanking input (BL) is held high for 4 ms minimum. The cursor memory is not affected by the clear (CLR) input. Cursor characters can be stored or removed even while the clear (CLR) is low. Note that the display will be cleared regardless of the state of the chip enables (CE1, CE2). However, to ensure that all four display characters are cleared, CLR should be held low for 4 ms following the last write cycle. Function BL CLR CUE CU CE1 CE2 WR DIG3 DIG2 DIG1 DIG0 CUE H H L XXXX Display previously written data H H H XXXX Display previously written cursor Clear H L XXXXX Clear data memory, cursor memory unchanged *NOTE: CLR should be held low for 4 ms following the last WRITE cycle to ensure all data is cleared. Blanking L X XXXXX Blank display, data and cursor" memories unchanged. Figure 4a. Cursor/Data Memory Write Truth Table. Figure 4b. Displayed Data Truth Table. ensure that the correct data is stored in the display. If D0 is in a low state during the write cycle, then a cursor character will be removed at the indicated location. If D0 is in a high state during the write cycle, then a cursor character will be stored at the indicated location. The presence or absence of a cursor character does not affect the ASCII data stored at that location. Again, when A1 = A0 = 0, the cursor character is stored in the furthest right-hand display location. All stored cursor characters are displayed if the cursor enable (CUE) is high. Similarly, the stored ASCII data words are displayed, regardless of the cursor characters, if the cursor enable (CUE) is low. The cursor enable (CUE) has no effect on the storage or removal of the cursor characters within the display. A flashing cursor is displayed by pulsing the cursor enable (CUE). For applications not requiring a cursor, the cursor enable (CUE) can be connected to ground and the cursor select (CU) can be connected to VCC. This inhibits the cursor function and allows only ASCII data to be loaded into the display. * L = LOGIC LOW INPUT “a” = ASCII CODE CORRESPODING TO SYMBOL “ ” H = LOGIC HIGH INPUT NC = NO CHANGE X = DON’T CARE = CURSOR CHARACTER (ALL SEGMENTS ON) Function BL CLR CUE CU CE1 CE2 WR A1 A0 D6 D5 D4 D3 D2 D1 D0 DIG3 DIG2 DIG1 DIG0 Write L X X H L L L L L a a aaaa a NC NC NC Data -OR- L H b b bbbb b NC NC NC Memory X H X H L L L H L c c cccc c NC NC NC H H d d dddd d NC NC NC Disable X X X H X X H X X X X XXXX X Previously Written Data X X X H X H X Data Memory X X X H H X X Write Write X X X L L L L L L X X XXXX H NC NC NC Cursor L H X X XXXX H NC NC NC H L X X XXXX H NC NC NC H H X X XXXX H NC NC NC Clear X X X L L L L L L X X XXXX L NC NC NC Cursor L H X X XXXX L NC NC NC H L X X XXXX L NC NC NC H H X X XXXX L NC NC NC Disable X X X L X X H X X X X XXXX X Previously Written Cursor X X X L X H X Cursor Memory X X X L H X X |
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