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TMS570LS0332PZ датащи(PDF) 86 Page - Texas Instruments |
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TMS570LS0332PZ датащи(HTML) 86 Page - Texas Instruments |
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86 / 110 page ![]() TMS570LS0432, TMS570LS0332 SPNS186B – OCTOBER 2012 – REVISED JUNE 2015 www.ti.com 7.7.4 MibSPI/SPI Master Mode I/O Timing Specifications Table 7-13. SPI Master Mode External Timing Parameters (CLOCK PHASE = 0, SPICLK = output, SPISIMO = output, and SPISOMI = input)(1)(2)(3) NO. PARAMETER MIN MAX UNIT 1 tc(SPC)M Cycle time, SPICLK(4) 40 256tc(VCLK) ns Pulse duration, SPICLK high (clock polarity = tw(SPCH)M 0.5tc(SPC)M – tr(SPC)M – 3 0.5tc(SPC)M + 3 0) 2(5) ns Pulse duration, SPICLK low (clock polarity = tw(SPCL)M 0.5tc(SPC)M – tf(SPC)M – 3 0.5tc(SPC)M + 3 1) Pulse duration, SPICLK low (clock polarity = tw(SPCL)M 0.5tc(SPC)M – tf(SPC)M – 3 0.5tc(SPC)M + 3 0) 3(5) ns Pulse duration, SPICLK high (clock polarity = tw(SPCH)M 0.5tc(SPC)M – tr(SPC)M – 3 0.5tc(SPC)M + 3 1) Delay time, SPISIMO valid before SPICLK td(SPCH-SIMO)M 0.5tc(SPC)M – 6 low (clock polarity = 0) 4(5) ns Delay time, SPISIMO valid before SPICLK td(SPCL-SIMO)M 0.5tc(SPC)M – 6 high (clock polarity = 1) Valid time, SPISIMO data valid after SPICLK tv(SPCL-SIMO)M 0.5tc(SPC)M – tf(SPC) – 4 low (clock polarity = 0) 5(5) ns Valid time, SPISIMO data valid after SPICLK tv(SPCH-SIMO)M 0.5tc(SPC)M – tr(SPC) – 4 high (clock polarity = 1) Setup time, SPISOMI before SPICLK low tsu(SOMI-SPCL)M tf(SPC) + 2.2 (clock polarity = 0) 6(5) ns Setup time, SPISOMI before SPICLK high tsu(SOMI-SPCH)M tr(SPC) + 2.2 (clock polarity = 1) Hold time, SPISOMI data valid after SPICLK th(SPCL-SOMI)M 10 low (clock polarity = 0) 7(5) ns Hold time, SPISOMI data valid after SPICLK th(SPCH-SOMI)M 10 high (clock polarity = 1) C2TDELAY*tc(VCLK) + 2*tc(VCLK) - (C2TDELAY+2) * tc(VCLK) - tf(SPICS) + CSHOLD = 0 Setup time CS active until tf(SPICS) + tr(SPC) – 7 tr(SPC) + 5.5 SPICLK high (clock ns C2TDELAY*tc(VCLK) + 3*tc(VCLK) - (C2TDELAY+3) * tc(VCLK) - tf(SPICS) + polarity = 0) CSHOLD = 1 tf(SPICS) + tr(SPC) – 7 tr(SPC) + 5.5 8(6) tC2TDELAY C2TDELAY*tc(VCLK) + 2*tc(VCLK) - (C2TDELAY+2) * tc(VCLK) - tf(SPICS) + CSHOLD = 0 Setup time CS active until tf(SPICS) + tf(SPC) – 7 tf(SPC) + 5.5 SPICLK low (clock polarity ns C2TDELAY*tc(VCLK) + 3*tc(VCLK) - (C2TDELAY+3) * tc(VCLK) - tf(SPICS) + = 1) CSHOLD = 1 tf(SPICS) + tf(SPC) – 7 tf(SPC) + 5.5 Hold time SPICLK low until CS inactive 0.5*tc(SPC)M + T2CDELAY*tc(VCLK) + 0.5*tc(SPC)M + T2CDELAY*tc(VCLK) + ns (clock polarity = 0) tc(VCLK) - tf(SPC) + tr(SPICS) - 7 tc(VCLK) - tf(SPC) + tr(SPICS) + 11 9(6) tT2CDELAY Hold time SPICLK high until CS inactive 0.5*tc(SPC)M + T2CDELAY*tc(VCLK) + 0.5*tc(SPC)M + T2CDELAY*tc(VCLK) + ns (clock polarity = 1) tc(VCLK) - tr(SPC) + tr(SPICS) - 7 tc(VCLK) - tr(SPC) + tr(SPICS) + 11 (C2TDELAY+1) * tc(VCLK) - tf(SPICS) – ns 10 tSPIENA SPIENAn Sample point (C2TDELAY+1)*tc(VCLK) 29 11 tSPIENAW SPIENAn Sample point from write to buffer (C2TDELAY+2)*tc(VCLK) ns (1) The MASTER bit (SPIGCR1.0) is set and the CLOCK PHASE bit (SPIFMTx.16) is cleared. (2) tc(VCLK) = interface clock cycle time = 1 / f(VCLK) (3) For rise and fall timings, see Table 5-6. (4) When the SPI is in Master mode, the following must be true: For PS values from 1 to 255: tc(SPC)M ≥ (PS +1)tc(VCLK) ≥ 40 ns, where PS is the prescale value set in the SPIFMTx.[15:8] register bits. For PS values of 0: tc(SPC)M = 2tc(VCLK) ≥ 40 ns. The external load on the SPICLK pin must be less than 60 pF. (5) The active edge of the SPICLK signal referenced is controlled by the CLOCK POLARITY bit (SPIFMTx.17). (6) C2TDELAY and T2CDELAY is programmed in the SPIDELAY register 86 Peripheral Information and Electrical Specifications Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TMS570LS0432 TMS570LS0332 |
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