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STM32L031C6 датащи(PDF) 93 Page - STMicroelectronics |
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STM32L031C6 датащи(HTML) 93 Page - STMicroelectronics |
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93 / 118 page ![]() DocID027063 Rev 4 93/118 STM32L031x4/6 Electrical characteristics 95 Table 68. SPI characteristics in voltage Range 2 (1) Symbol Parameter Conditions Min Typ Max Unit fSCK 1/tc(SCK) SPI clock frequency Master mode -- 8 MHz Slave mode Transmitter 1.65<VDD<3.6V 8 Slave mode Transmitter 2.7<VDD<3.6V 8(2) Duty(SCK) Duty cycle of SPI clock frequency Slave mode 30 50 70 % tsu(NSS) NSS setup time Slave mode, SPI presc = 2 4*Tpclk - - ns th(NSS) NSS hold time Slave mode, SPI presc = 2 2*Tpclk - - tw(SCKH) tw(SCKL) SCK high and low time Master mode Tpclk-2 Tpclk Tpclk+2 tsu(MI) Data input setup time Master mode 12 - - tsu(SI) Slave mode 11 - - th(MI) Data input hold time Master mode 6.5 - - th(SI) Slave mode 2 - - ta(SO Data output access time Slave mode 18 - 52 tdis(SO) Data output disable time Slave mode 12 - 42 tv(SO) Data output valid time Slave mode - 40 55 Master mode - 16 26 tv(MO) Data output hold time Slave mode 12 - - th(SO) Master mode 4 - - 1. Guaranteed by characterization results. 2. The maximum SPI clock frequency in slave transmitter mode is determined by the sum of tv(SO) and tsu(MI) which has to fit into SCK low or high phase preceding the SCK sampling edge. This value can be achieved when the SPI communicates with a master having tsu(MI) = 0 while Duty(SCK) = 50%. |
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