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ADC0804LCJ 데이터시트(PDF) 28 Page - National Semiconductor (TI) |
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ADC0804LCJ 데이터시트(HTML) 28 Page - National Semiconductor (TI) |
28 / 41 page Functional Description (Continued) 4.2 Interfacing the Z-80 The Z-80 control bus is slightly different from that of the 8080. General RD and WR strobes are provided and sepa- rate memory request, MREQ, and I/O request, IORQ, sig- nals are used which have to be combined with the general- ized strobes to provide the equivalent 8080 signals. An advantage of operating the A/D in I/O space with the Z-80 is that the CPU will automatically insert one wait state (the RD and WR strobes are extended one clock period) to allow more time for the I/O devices to respond. Logic to map the A/D in I/O space is shown in Figure 14. Additional I/O advantages exist as software DMA routines are available and use can be made of the output data transfer which exists on the upper 8 address lines (A8 to DS005671-21 FIGURE 13. INS8048 Interface SAMPLE PROGRAM FOR Figure 13 INS8048 INTERFACE DS005671-A0 DS005671-23 FIGURE 14. Mapping the A/D as an I/O Device for Use with the Z-80 CPU www.national.com 28 |
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