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TMS370 Datasheet(PDF) 56 Page - Texas Instruments |
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TMS370 Datasheet(HTML) 56 Page - Texas Instruments |
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56 / 66 page ![]() TMS370Cx4x 8-BIT MICROCONTROLLER SPNS016C – NOVEMBER 1992 – REVISED FEBRUARY 1997 56 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 SERIAL COMMUNICATIONS INTERFACE 1 (SCI1) EXTERNAL CLOCK ISOSYNCHRONOUS MODE I/O TIMING SCI1 isosynchronous mode timing characteristics and requirements for external clock (see Note 10 and Figure 22) NO. PARAMETER MIN MAX UNIT 31 tc(SCC) Cycle time, SCICLK 10tc ns 32 tw(SCCL) Pulse duration, SCICLK low 4.25tc + 120 ns 33 tw(SCCH) Pulse duration, SCICLK high tc + 120 ns 34 td(SCCL-TXDV) Delay time, SCITXD valid after SCICLK low 4.25tc + 145 ns 35 tv(SCCH-TXD) Valid time, SCITXD data after SCICLK high tw(SCCH) ns 36 tsu(RXD-SCCH) Setup time, SCIRXD to SCICLK high 40 ns 37 tv(SCCH-RXD) Valid time, SCIRXD data after SCICLK high 2tc ns NOTE 10: tc = system-clock cycle time = 1/SYSCLK. SCICLK SCITXD SCIRXD Data Valid Data Valid 32 33 31 34 35 36 37 Figure 22. SCI1 Isosynchronous Mode Timing Diagram for External Clock |
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