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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMS320VC549 датащи(PDF) 44 Page - Texas Instruments |
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TMS320VC549 датащи(HTML) 44 Page - Texas Instruments |
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44 / 63 page  TMS320VC549 FIXEDPOINT DIGITAL SIGNAL PROCESSOR SPRS078G − SEPTEMBER 1998 − REVISED OCTOBER 2004 44 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 serial port transmit timing (continued) switching characteristics over recommended operating conditions for serial port transmit with internal clocks and frames [H = 0.5tc(CO)] (see Figure 23) PARAMETER 549-80 549-100 549-120 UNIT MIN TYP MAX tc(SCK) Cycle time, serial port clock 8H ns td(FSX) Delay time, CLKX rising to FSX 7 ns td(DX) Delay time, CLKX rising to DX 7 ns tdis(DX) Disable time, CLKX rising to DX 20 ns th(DX) Hold time, DX valid after CLKX rising edge −2 ns tf(SCK) Fall time, serial port clock 3 ns tr(SCK) Rise time, serial port clock 3 ns tw(SCK) Pulse duration, serial port clock low/high 4H − 4 ns DX FSX CLKX 8/16 7/15 2 1 th(DX) tw(SCK) tc(SCK) td(FSX) td(FSX) td(DX) tdis(DX) tw(SCK) tr(SCK) tf(SCK) Figure 23. Serial Port Transmit Timing With Internal Clocks and Frames |
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