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56F803 датащи(PDF) 37 Page - Freescale Semiconductor, Inc |
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56F803 датащи(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 57 page ![]() 56F803 Technical Data, Rev. 16 32 Freescale Semiconductor Figure 3-11 External Bus Asynchronous Timing 3.7 Reset, Stop, Wait, Mode Select, and Interrupt Timing 1. Timing is both wait state and frequency dependent. In the formulas listed, WS = the number of wait states and T = Clock Period. For 80MHz operation, T = 12.5ns. 2. Parameters listed are guaranteed by design. To calculate the required access time for an external memory for any frequency < 80Mhz, use this formula: Top = Clock period @ desired operating frequency WS = Number of wait states Memory Access Time = (Top*WS) + (Top- 11.5) Table 3-11 Reset, Stop, Wait, Mode Select, and Interrupt Timing 1, 5 Operating Conditions: V SS = VSSA = 0 V, VDD = VDDA = 3.0–3.6V, TA = –40° to +85°C, CL ≤ 50pF Characteristic Symbol Min Max Unit See Figure RESET Assertion to Address, Data and Control Signals High Impedance tRAZ —21 ns Figure 3-12 Minimum RESET Assertion Duration2 OMR Bit 6 = 0 OMR Bit 6 = 1 tRA 275,000T 128T — — ns ns Figure 3-12 RESET De-assertion to First External Address Output tRDA 33T 34T ns Figure 3-12 A0–A15, PS, DS (See Note) WR D0–D15 RD Note: During read-modify-write instructions and internal instructions, the address lines do not change state. Data In Data Out tAWR tARDA tARDD tRDA tRD tRDRD tRDWR tWRWR tWR tDOS tWRD tWRRD tAD tDOH tDRD tRDD |
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