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

(b) 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 communication direction can be switched by the
specification of bit 1 (DIR0) of serial operation mode specification register 0 (CSIMA0).
SCKA0
SIA0
SOA0
SCKA0
SIA0
SOA0
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CHAPTER 17 SERIAL INTERFACE CSIA0
Figure 17-11. Format of Transmit/Receive Data
(a) MSB-first (DIR0 bit = 0)
DO7 DO6 DO5
DI7 DI6 DI5
(b) LSB-first (DIR0 bit = 1)
DO0 DO1 DO2
DI0 DI1 DI2
User's Manual U15947EJ2V0UD
DO4 DO3 DO2
DI4 DI3 DI2
DO3 DO4 DO5
DI3 DI4 DI5
*
DO1 DO0
DI1 DI0
DO6 DO7
DI6 DI7