Serial Data Direction Select Function - NEC V850E/RS1 User Manual

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]):
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Chapter 14 Queued CSI (CSI30, CSI31)
Figure 14-12: Serial Data Direction Select Function
SCK3
SI3
SO3
Write operation from SFDB to FIFO
15 8 7
SFDB
FIFO
SIO
SO3
15 8 7
SCK3
SI3
SO3
Write operation from SFDB to FIFO
15 8 7
SFDB
FIFO
SO3 SIO
15 8 7
User's Manual U16702EE3V2UD00
(a) MSB first (DIR = 0)
DI7 DI6 DI5 DI4 DI3
DO7 DO6 DO5 DO4 DO3
Read operation from SIRB
0 15
SI3
SO3
0 15
(b) LSB first (DIR = 0)
DI0 DI1 DI2 DI3 DI4
DO0 DO1 DO2 DO3 DO4
Read operation from SIRB
0 15
SI3 SO3
0 15
DI2 DI1 DI0
DO2 DO1 DO0
8 7 0
Read value
SIRB
SIO SI3
8 7 0
DI5 DI6 DI7
DO5 DO6 DO7
8 7 0
Read value
SIRB
SIO SI3
8 7 0
477