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DLX2416 データシート(PDF) 3 Page - OSRAM GmbH |
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DLX2416 データシート(HTML) 3 Page - OSRAM GmbH |
3 / 5 page 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA Appnote 14 www.infineon.com/opto • 1-888-Infineon (1-888-463-4636) OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany www.osram-os.com • +49-941-202-7178 3 May 31, 2000-12 Operation Multiplexed display systems sequentially read and display data from a memory device. In synchronous systems, control cir- cuitry must compare the location of data to be read to the loca- tion or position of new data to be stored or displayed, i.e., synchronize before a Write can be done. This can be slow and cumbersome. Data entry in “intelligent displays” is asynchronous and may be done in any random order. Loading data is similar to writing into a RAM. Each digit has its own memory location and will display until replaced by another code. The waveforms of Figure 4 demonstrate the relationships of the signals required to generate a write cycle. (Check individual data sheet for minimum values). As can be seen from the waveforms, all signals are referenced from the rising or trailing edge of write. Cursor The cursor function causes all dots to light at 50% brightness. The cursor can be used to indicate the position in the display of the next character to be entered. The cursor is not a character but overrides the display of a stored character. Upon removal of the cursor, the display will again show the character stored in memory. Figure 4. Write cycle waveforms Figure 5. Tables—loading data and loading cursor t AH t W t AS t DS t DH 4 V 2 V 0 V 4 V 2 V 0 V 4 V 2 V 0 V CU ,A0,A1 CE1,CE2 WR Data 0 – 6 H H H H H H H H H Blank Previous Characters Normal Data Entry Enable Previous Stored Cursors L H H H H H H H H H H NC NC NC NC NC D D D BL CE1 CE2 CUE CU WR CLR A 1 A 0 D6 D5 D4 D3 D2 D1 D0 Digit Digit Digit Digit See Character Set Loading Cursor Loading Data X H X X L L L L L L L X L L L L L L L L L L H H H H H H H H H H H X X X H L L L L L L L H H H H H H H H H H H X X X X L L H H L H – X X X X L H L H L L – X X X X H H H H H H – X X X X L L L L L L – X X X X L L L L L L – X X X X L L L L L H – X X X X L L L H H L – X X X X L H H L L H – X X X X H L H L H H – X X H X L L L L L L L L L L L L L L L L L L L L L L L L L L H H H H H L L H H H L L L L H L H X H L L L L H L H H H H H H H H H H X X L L H H X L X X X L H L H X L X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X H H H H X L X NC NC NC NC C C C K NC NC NC B B NC B B NC NC A A NC A E E NC NC NC D D NC NC K K NC B B E E E X=Don ‘ t care NC=No change from previously displayed characters 3 2 1 0 =all dots/segments on at half brightness The cursor can be written into any digit position by setting the cursor enable (CUE) high, setting the digit address (A1, A0), enabling Chip Enable, (CE1, CE2), cursor select (CU), Write (WR) and Data (D0). A high on data line D0 will place a cursor into the position set by the address A0 and A1. Conversely, a low on D0 will remove the cursor. The cursor will remain dis- played after the cursor (CU) and write (WR) signals have been removed. During the cursor-write sequence, data lines D1 through D6 are ignored. If the user does not wish to use the cursor function, the cursor enable (CUE) can be tied low to disable the cursor function. For a flashing cursor, simply pulse the CUE line after cursor data has been stored. General Design Considerations Using Positive true logic, address order is from right to left. For left to right address order, use the “ones complement” or sim- ple inversion of the addresses. A “display test” or “lamp test” function can be realized by sim- ply storing a cursor into all digits. Because of the random state of the cursor RAM after power up, if the cursor function is to be used, it will be necessary to clear cursors initially to assure that all cursor memories contain its zero state. This is easily accomplished with the CLR input. |
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同様の説明 - DLX2416 |
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