Datasheet

MCP3911
DS20002286B-page 44  2012-2013 Microchip Technology Inc.
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 is 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
CS
A6 A5 A4 A3 A2 A1 A0
D6 D5 D4 D3 D2 D1
D0
(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
D0
HI-Z
HI-Z
D7 D7
R/W
HI-Z
SCK
SDI
SDO
CS
R/W
A6 A5 A4 A3 A2 A1 A0
D7 D6 D5 D4 D3 D2 D1
(ADDRESS) DATA
(ADDRESS + 1) DATA
D6 D5 D4 D3 D2
D1
D0
Data Transitions on
the Falling Edge
MCU and MCP3911 Latch
Bits on the Rising Edge
D0
HI-Z
HI-Z
D7
HI-Z