APM32F103TBU7-R datasheet(47/78 Pages) GEEHY

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Figure 14 Bus AC Waveform and Measurement Circuit

I²C总线

VDD

4.7KΩ

SCL

SDA

重复的开始条件

开始条件

tsu(STA)

tsu(STO)

tsu(STO:STA)

停止条件

开始条件

th(SDA)

tf(STA)

SDA

tr(SDA)

tsu(SDA)

tf(SCL)

tw(SCLL)

SCL

th(STA)

tw(SCLH)

MCU

Note: The measuring points are set at CMOS levels: 0.3VDD and 0.7VDD.

5.11.2 SPI peripheral characteristics

Table38 SPI Characteristics (TA=25℃, VDD=3.3V)

Symbol

Parameter

Condition

Minimum

value

Maximum

value

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master Mode

MHz

Slave Mode

tr(SCK)

tf(SCK)

SP clock rise and fall time

Load capacitance: C = 30pF

7.1

tsu(NSS)(2)

NSS setup time

Slave mode, fPCLK= 36MHz

111.4

th(NSS)(2)

NSS hold time

Slave mode, fPCLK= 36MHz

55.6

tw(SCKH)(2)

tw(SCKL)(2)

SCK high and low time

Main mode, fPCLK = 36MHz,

Prescaler factor=4

55.1

55.9

tsu(MI)(2)

tsu(SI)(2)

Data input setup time

Master Mode

10.9

Slave Mode

21.3

th(MI)(2)

th(SI)(2)

Data input hold time

Master Mode

Slave Mode

ta(SO)(2)(3)

Data output access time

Slave mode, fPCLK = 20MHz

6.5

8.7

Bus

Start repeated

Start

Stop

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