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STM32F446RC 数据表(PDF) 129 Page - STMicroelectronics |
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STM32F446RC 数据表(HTML) 129 Page - STMicroelectronics |
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129 / 202 page  DocID027107 Rev 6 129/202 STM32F446xC/E Electrical characteristics 175 SPI interface characteristics Unless otherwise specified, the parameters given in Table 63 for SPI are derived from tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage conditions summarized in Table 16, with the following configuration: • Output speed is set to OSPEEDRy[1:0] = 10 • Capacitive load C=30pF • Measurement points are done at CMOS levels: 0.5VDD Refer to Section 6.3.17: I/O port characteristics for more details on the input/output alternate function characteristics (NSS, SCK, MOSI, MISO for SPI). Table 63. SPI dynamic characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fSCK 1/tc(SCK) SPI clock frequency Master full duplex/receiver mode, 2.7 V≤VDD≤3.6 V SPI1/4 -- 45 MHz Master transmitter 1.71V <VDD< 3.6V SPI1/4 45 Master 1.71V <VDD< 3.6V SPI1/2/3/4 22.5 Slave transmitter/ full duplex mode SPI1/4 2.7V <VDD< 3.6V 45 Slave receiver mode SPI1/4 1.71V <VDD< 3.6V 45 Slave mode SPI1/2/3/4 1.71V <VDD< 3.6V 22.5(2) Duty(SCK) Duty cycle of SPI clock frequency Slave mode 30 50 70 % |
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