Wire Serial I/O Mode Timing - NEC PD789488 User Manual

(2) Communication operation
In 3-wire serial I/O mode, data transmission/reception is performed in 8-bit units.
transmitted/received bit by bit in synchronization with the serial clock.
Serial I/O shift register 1A0 (SIO1A0) shift operations are performed in synchronization with the fall of the
serial clock (SCK10). Then transmit data is held in the SO10 latch and output from the SO10 pin. Also,
receive data input to the SI10 pin is latched in the SIO1A0 on the rise of SCK10.
At the end of an 8-bit transfer, the operation of SIO1A0 stops automatically, and the interrupt request signal
(INTCSI10) is generated.
SIO1A0
write
SCK10
SO10
Note
SI10
INTCSI10
Note The value of the last bit previously output is output.
CHAPTER 12 SERIAL INTERFACE 1A0
Figure 12-5. 3-Wire Serial I/O Mode Timing (1/2)
(i) Master operation timing
1 2 3
DO7 DO6 DO5
DI7 DI6 DI5
User's Manual U15331EJ4V1UD
4 5 6
DO4 DO3 DO2
DI4 DI3 DI2
Data is
7 8
DO1 DO0
DI1 DI0
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