Data Transfer Direction Specification Function; Figure 17-12: Data Transfer Direction Specification (Msb First) - NEC V850E/PH2 User Manual

17.5.3 Data transfer direction specification function

The data transfer direction can be changed by using the DIRn bit of the CSIM3n register (n = 0, 1).
(1) MSB first (DIRn bit = 0)

Figure 17-12: Data Transfer Direction Specification (MSB first)

(a) Transfer direction: MSB first, Transfer data length: 8 Bits
SCK3n (I/O)
SI3n (input)
SO3n (output)
SO3n
(c) Reading from CSIBUFn register or SFDB3n register
CSIBUFn or SIRB3n
μPD70F3187:
Remark:
μPD70F3447:
Chapter 17 Clocked Serial Interface 3 (CSI3)
DI7 DI6
DO7 DO6
(b) Writing from SFDB3n register to CSIBUFn register
15
SFDB3n
CSIBUFn Data
15
SFDB3n
Undefined value
(read value)
SO3n
n = 0, 1
n = 0
User's Manual U16580EE3V1UD00
DI5 DI4 DI3
DO5 DO4 DO3
8 7 0
00H
SIO3n
8 7
Data
SIO3n
DI2 DI1
DO2 DO1
SI3n
0
SI3n
DI0
DO0
697