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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32MP151AAA3T датащи(PDF) 228 Page - STMicroelectronics |
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STM32MP151AAA3T датащи(HTML) 228 Page - STMicroelectronics |
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228 / 245 page  Electrical characteristics STM32MP151A 228/245 DS12500 Rev 1 6.3.35 USART interface characteristics Unless otherwise specified, the parameters given in Table 106 for USART are derived from tests performed under the ambient temperature, fHCLK frequency and VDD supply voltage conditions summarized in Table 106, 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 6.3.16: I/O port characteristics for more details on the input/output alternate function characteristics (NSS, CK, TX, RX for USART). Table 106. USART characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fCK USART clock frequency Master mode USART2,3,6 -- 12.5 MHz Master mode USART1 16.5 Slave mode - - 27 tsu(NSS) NSS setup time Slave mode tker+2 - - ns th(NSS) NSS hold time Slave mode 2 - - ns tw(CKH), tw(CKL) CK high and low time Master mode 1/fCK/2 - 1 1/fck/2 1/fCK/2 + 1 ns tsu(RX) Data input setup time Master mode tker+3 - - ns Slave mode 2 - - thRX) Data input hold time Master mode 1 - - ns Slave mode 1 - - tv(TX) Data output valid time Slave mode - 10 18 ns Master mode - 0.5 1 th(TX) Data output hold time Slave mode 8 - - ns Master mode 0 - - 1. 1.Guaranteed by characterization results. |
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