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DLX3416 Datasheet(PDF) 5 Page - OSRAM GmbH |
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DLX3416 Datasheet(HTML) 5 Page - OSRAM GmbH |
5 / 5 page 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA Appnote 17 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 5 May 31, 2000-12 Figure 7. 16-digit parallel I/O system Figure 8. Mapped interface. Figure 9. Interface with 6800 microprocessor 0-6 7 Display Port A D0 Display Display Display D3 D4 D7 D8 D11 D12 D15 Port B Port C 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 Control Data 8080 µP System 8255 Vcc GND D0–D6 CU CLR CUE BL A0 A1 A2 A3 3 2 1 0 WR A B C D 7442 5 / Address Dis play Select Decoder Parallel I/0 Device Optional Buffers Reset Int Hold Wait Display Display D isplay Display 8980 Z80 6502 D15 D0 OSC A0 A1 A2 A3 Data 0-6 Data Control CUE CLR BL WR Address Data Control Data Address DBE Decoder 6820 PIA CUE BL CLR Data Address H1 H2 01 02 Clock Driver 6800 BA VMA R/W CE CE Reset NMI Halt IRQ TSC A0–A1 D0–D7 Display Display Display Display Data D15 D0 W Figure 7 illustrates a 16 character display with an 8080 system using the 8255 programmable peripheral interface I/O device. The following program will display a simple 16 character mes- sage using this interface. I/O or Memory Mapped Addressing Some designers may wish to avoid the additional cost of a par- allel I/O in their system. Structuring the addressing architecture for the 3416 to look like a set of peripheral or output devices (I/O mapped) or RAM’s and ROM’s (memory mapped) is very easy. Figure 8 shows the simplicity of interfacing to micropro- cessors, such as 8080, Z80 and 6502 as examples. The interface with the 6800 microprocessor in Figure 9 illus- trates the need for designers to check the timing requirements of the 3416 and the µP. The typical data output hold time is only 30 ns for DBE= ∅2 timing; two inverters in the DBE line are added to increase the data output hold time for compatibility with the 50 nS minimum specification of the 3416. Conclusion Note that although other manufacturers’ products are used in examples, this application note does not imply specific endorsement, or recommendation or warranty of other manu- facturer’s products by Infineon / OSRAM. The interface schemes shown demonstrate the simplicity of using the 3416 with microprocessors. The slight differences encountered with various microprocessors to interface with the 3416 are similar to those encountered when using different RAMs. The techniques used in the examples were shown for their generality, and any display of this family are interchange- able in these examples. The user will undoubtedly invent other schemes to optimize his particular system to its requirements. |
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