CDB48500-USB【PDF 13/23 页】KIT USB EVALUATION FOR CDB48500

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5.10 Switching Characteristics—Serial Control Port–SPI Master Mode

5.10 Switching Characteristics—Serial Control Port–SPI Master Mode

Parameter

Symbol Min

Typical

Max

Units

SCP_CLK frequency 1

SCP_CS# falling to SCP_CLK rising 3

SCP_CLK low time

SCP_CLK high time

Setup time SCP_MISO input

Hold time SCP_MISO input

SCP_CLK low to SCP_MOSI output valid

SCP_CLK low to SCP_CS# falling

SCP_CLK low to SCP_CS# rising

Bus free time between active SCP_CS#

SCP_CLK falling to SCP_MOSI output high-Z

f spisck

t spicss

t spickl

t spickh

t spidsu

t spidh

t spidov

t spicsl

t spicsh

t spicsx

t spidz

—

—

20

20

13

5

—

7

—

—

—

—

11*DCLKP + (SCP_CLK PERIOD)/2

—

—

—

—

—

—

11*DCLKP + (SCP_CLK PERIOD)/2

3*DCLKP

—

F xtal /2 2

—

—

—

—

—

8

—

—

—

20

MHz

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

1.The specification f spisck indicates the maximum speed of the hardware. The system designer should be aware that the actual maximum speed of the

communication port may be limited by the firmware application.

2.See Section 5.7 .

3.SCP_CLK PERIOD refers to the period of SCP_CLK as being used in a given application. It does not refer to a tested parameter.

t spicsx

t spicss

EE_CS#

t spicsl

0

1

2

t spickl

6

7

0

5

6

7

t spicsh

SCP_CLK

f spisck

t spickh

SCP_MISO

A6

A5

A0

R/W

MSB

LSB

t spidsu

SCP_MOSI

t spidh

t spidov

MSB

LSB

t spidz

Figure 5-4. Serial Control Port–SPI Master Mode Timing

5.11 Switching Characteristics—Serial Control Port–I 2 C Slave Mode

Parameter

Symbol Min

Typical

Max

Units

SCP_CLK

frequency 1

f iicck

—

—

400

kHz

SCP_CLK low time

SCP_CLK high time

SCP_SCK rising to SCP_SDA rising or falling for START or STOP condition

START condition to SCP_CLK falling

SCP_CLK falling to STOP condition

Bus free time between STOP and START conditions

Setup time SCP_SDA input valid to SCP_CLK rising

Hold time SCP_SDA input after SCP_CLK falling

t iicckl

t iicckh

t iicckcmd

t iicstscl

t iicstp

t iicbft

t iicsu

t iich

1.25

1.25

1.25

1.25

2.5

3

100

20

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

μs

μs

μs

μs

μs

μs

ns

ns

13

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