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NSC800D Datasheet(PDF) 18 Page - National Semiconductor (TI) |
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NSC800D Datasheet(HTML) 18 Page - National Semiconductor (TI) |
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18 / 76 page ![]() 90 Timing and Control (Continued) Figure 10 shows the timing for memory read (other than opcode fetchs) and write cycles with and without a wait state The RD stobe is widened by t 2 (half the machine state) for memory reads so that the actual latching of the input data occurs later Figure 11 shows the timing for input and output cycles with and without wait states The CPU automatically inserts one wait state into each IO instruction to allow sufficient time for an IO port to decode the address TLC5171 – 19 FIGURE 11a Input and Output Cycles without WAIT States TLC5171 – 20 WAIT state automatically inserted during IO operation FIGURE 11b Input and Output Cycles with WAIT States 18 |
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