Format Of Csia0 Transmit/Receive Data - NEC 78K0 User Manual

(d) Data format
In the data format, data is changed in synchronization with the SCKA0 falling edge as shown below.
The data length is fixed to 8 bits and the data transfer direction can be switched by the specification of bit
1 (DIR0) of serial operation mode specification register 0 (CSIMA0).
Figure 17-22. Format of CSIA0 Transmit/Receive Data
SCKA0
SIA0 DO7
SOA0 DI7
SCKA0
SIA0 DO0
SOA0 DI0
CHAPTER 17 SERIAL INTERFACE CSIA0
(a) MSB-first (DIR0 bit = 0)
DO6 DO5 DO4
DI6 DI5 DI4
(b) LSB-first (DIR0 bit = 1)
DO1 DO2 DO3
DI1 DI2 DI3
*
User's Manual U15947EJ2V0UD
DO3 DO2 DO1
DI3 DI2 DI1
DO4 DO5 DO6
DI4 DI5 DI6
DO0
DI0
DO7
DI7
411