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STM32F405 数据表(PDF) 122 Page - STMicroelectronics |
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STM32F405 数据表(HTML) 122 Page - STMicroelectronics |
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122 / 204 page  Electrical characteristics STM32F405xx, STM32F407xx 122/203 DS8626 Rev 9 SPI interface characteristics Unless otherwise specified, the parameters given in Table 55 for SPI are derived from tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage conditions summarized in Table 14 with the following configuration: • Output speed is set to OSPEEDRy[1:0] = 10 • Capacitive load C = 30 pF • Measurement points are done at CMOS levels: 0.5 VDD Refer to Section 5.3.16: I/O port characteristics for more details on the input/output alternate function characteristics (NSS, SCK, MOSI, MISO). Table 55. SPI dynamic characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fSCK SPI clock frequency Master mode, SPI1, 2.7V < VDD < 3.6V -- 42 MHz Slave mode, SPI1, 2.7V < VDD < 3.6V 42 1/tc(SCK) Master mode, SPI1/2/3, 1.7V < VDD < 3.6V -- 21 Slave mode, SPI1/2/3, 1.7V < VDD < 3.6V 21 Duty(SCK) Duty cycle of SPI clock frequency Slave mode 30 50 70 % |
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