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STM32F479AI 数据表(PDF) 187 Page - STMicroelectronics |
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STM32F479AI 数据表(HTML) 187 Page - STMicroelectronics |
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187 / 208 page  DocID028010 Rev 2 187/208 STM32F479xx Electrical characteristics 187 5.3.34 RTC characteristics Table 112. Dynamic characteristics: SD / MMC characteristics, VDD = 1.71 to 1.9 V(1)(2) Symbol Parameter Conditions Min Typ Max Unit fPP Clock frequency in data transfer mode - 0 - 50 MHz - SDIO_CK/fPCLK2 frequency ratio - - - 8/3 - tW(CKL) Clock low time fpp =50 MHz 9.5 10.5 - ns tW(CKH) Clock high time 8.5 9.5 - CMD, D inputs (referenced to CK) in eMMC mode tISU Input setup time HS fpp =50 MHz 0.5 - - ns tIH Input hold time HS 3.5 - - CMD, D outputs (referenced to CK) in eMMC mode tOV Output valid time HS fpp =50 MHz - 13.5 14.5 ns tOH Output hold time HS 13.0 - - 1. Guaranteed based on test during characterization. 2. Cload = 20 pF. Table 113. RTC characteristics Symbol Parameter Conditions Min Max -fPCLK1/RTCCLK frequency ratio Any read/write operation from/to an RTC register 4 - |
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