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STM32L081CB 데이터시트(PDF) 92 Page - STMicroelectronics |
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STM32L081CB 데이터시트(HTML) 92 Page - STMicroelectronics |
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92 / 110 page ![]() Electrical characteristics STM32L081xx 92/110 DocID027513 Rev 4 Figure 27. SPI timing diagram - slave mode and CPHA = 0 Table 69. SPI characteristics in voltage Range 3 (1) Symbol Parameter Conditions Min Typ Max Unit fSCK 1/tc(SCK) SPI clock frequency Master mode -- 2 MHz Slave mode 2(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 1.5 - - tsu(SI) Slave mode 6 - - th(MI) Data input hold time Master mode 13.5 - - th(SI) Slave mode 16 - - ta(SO Data output access time Slave mode 30 - 70 tdis(SO) Data output disable time Slave mode 40 - 80 tv(SO) Data output valid time Slave mode - 30 70 tv(MO) Master mode - 7 9 th(SO) Data output hold time Slave mode 25 - - th(MO) Master mode 8 - - 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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