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ST10F167 数据表(PDF) 63 Page - STMicroelectronics |
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ST10F167 数据表(HTML) 63 Page - STMicroelectronics |
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63 / 69 page ![]() 63/69 ST10F167 20.5.9 CLKOUT and READY VDD =5 V ± 5%, VSS =0 V, TA = -40 to +85 °C CL (for PORT0, PORT1, Port 4, ALE, RD, WR, BHE, CLKOUT) = 100 pF,CL (for Port 6, CS) = 100 pF Notes 1:These timings are given for test purposes only, in order to assure recognition at a specific clock edge. 2:Demultiplexed bus is the worst case. For multiplexed bus 2TCL are to be added to the maximum values. This adds even more time for deactivating READY. The 2tA and 2tc refer to the next bus cycle, tF refers to the current bus cycle. Table 20.8 CLKOUT and READY Characteristics Parameter Symbol Max. CPU Clock =20 MHz Variable CPU Clock 1/2TCL = 1 to 20 MHz Unit min. max. min. max. CLKOUT cycle time t29 CC 50 50 2TCL 2TCL ns CLKOUT high time t 30 CC 20 – TCL – 5 – ns CLKOUT low time t 31 CC 15 – TCL – 10 – ns CLKOUT rise time t 32 CC – 5 – 5 ns CLKOUT fall time t 33 CC – 10 – 10 ns CLKOUT rising edge to ALE falling edge t 34 CC -5 + t A 10 + t A -5 + t A 10 + t A ns Synchronous READY setup time to CLKOUT t 35 SR 30 – 30 – ns Synchronous READY hold time after CLKOUT t 36 SR 0 – 0 – ns Asynchronous READY low time t37 SR 65 – 2TCL + 15 – ns Asynchronous READY setup time 1) t 58 SR 15 – 15 – ns Asynchronous READY hold time 1) t 59 SR 0 – 0 – ns Async. READY hold time after RD, WR high (Demul- tiplexed Bus) 2) t 60 SR 0 0 + t c +2 t A + tF 2) 0 TCL - 25 + t c +2tA + tF 2) ns |
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