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Chapter 14
Queued CSI (CSI30, CSI31)
User’s Manual U16702EE3V2UD00
14.3.2 Serial Data Direction Select Function
The serial data direction is selectable using the DIR bit in the CSIM register. The examples below show
the communication for data length of 8 bit (CCL[3:0] = [1,0,0,0]):
Figure 14-12:
Serial Data Direction Select Function
(a) MSB first (DIR = 0)
(b) LSB first (DIR = 0)
SFDB
15
8 7
0
Write operation from SFDB to FIFO
FIFO
SIO
15
8 7
0
SI3
SO3
Read value
15
8 7
0
Read operation from SIRB
SIRB
SIO
15
8 7
0
SI3
SO3
SI3
SCK3
SO3
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
SI3
SCK3
SO3
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
SFDB
15
8 7
0
Write operation from SFDB to FIFO
FIFO
SIO
15
8 7
0
SI3
SO3
Read value
15
8 7
0
Read operation from SIRB
SIRB
SIO
15
8 7
0
SI3
SO3
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