STM32F205RF 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F205RF

ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera

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Electrical characteristics

Figure 73. SD default mode

STM32F20xxx

CK

D, CMD

(output)

tOVD

tOHD

5.3.28

ai14888

Table 83. SD / MMC characteristics

Symbol

Parameter

Conditions

Min

fPP

Clock frequency in data transfer

mode

CL ≤ 30 pF

0

-

SDIO_CK/fPCLK2 frequency ratio

-

-

tW(CKL) Clock low time, fPP = 16 MHz

CL ≤ 30 pF

32

tW(CKH) Clock high time, fPP = 16 MHz

CL ≤ 30 pF

31

tr

Clock rise time

CL ≤ 30 pF

tf

Clock fall time

CL ≤ 30 pF

CMD, D inputs (referenced to CK)

tISU

Input setup time

CL ≤ 30 pF

2

tIH

Input hold time

CL ≤ 30 pF

0

CMD, D outputs (referenced to CK) in MMC and SD HS mode

tOV

Output valid time

CL ≤ 30 pF

tOH

Output hold time

CL ≤ 30 pF

0.3

CMD, D outputs (referenced to CK) in SD default mode(1)

tOVD Output valid default time

CL ≤ 30 pF

tOHD Output hold default time

CL ≤ 30 pF

0.5

1. Refer to SDIO_CLKCR, the SDI clock control register to control the CK output.

Max Unit

48

MHz

8/3

-

ns

3.5

5

ns

6

ns

7

ns

RTC characteristics

Table 84. RTC characteristics

Symbol

Parameter

Conditions

Min

Max

-

fPCLK1/RTCCLK frequency ratio

Any read/write operation

from/to an RTC register

4

-

142/177

Doc ID 15818 Rev 9

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