MCP3911 datasheet(44/72 Pages) MICROCHIP

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MCP3911

DS22286A-page 44

6.5

SPI MODE 1,1 – Clock Idle High,

Read/Write Examples

In this SPI mode, SCK idles high. For the MCP3911,

this means that there will be a falling edge on SCK

before there is a rising edge.

FIGURE 6-2:

Device Read (SPI Mode 1,1 – SCK Idles High).

FIGURE 6-3:

Device Write (SPI Mode 1,1 – SCK Idles High).

Note:

Changing from an SPI Mode 1,1 to an SPI

Mode 0,0 is possible and can be done

while CS pin is logic high.

SCK

SDI

SDO

A5 A4 A3

A1 A0

D6 D5 D4 D3

D2 D1

(ADDRESS) DATA

(ADDRESS + 1) DATA

D6 D5

D4 D3

D2 D1

Data Transitions on

the Falling Edge

MCU and MCP3911 Latch

Bits on the Rising Edge

HI-Z

R/W

HI-Z

SCK

SDI

SDO

R/W

A6 A5

A3 A2

D6 D5

D4 D3

D2 D1

(ADDRESS) DATA

(ADDRESS + 1) DATA

D6 D5

D4 D3

Data Transitions on

the Falling Edge

MCU and MCP3911 Latch

Bits on the Rising Edge

HI-Z

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