NEC mPD789426 Series User Manual page 244

(viii) Slave operation (when DAP20 = 1, CKP20 = 0, SSE20 = 0)
SIO20
write
SCK20
Note
SIO20 write (master)
SI20
SO20
INTCSI20
Note The data of SI20 is loaded at the first falling edge of SCK20. Make sure that the master outputs the
first bit before the first falling of SCK20.
SS20
SIO20
write
SCK20
Note 1
SIO20 write (master)
SI20
Hi-Z
SO20
INTCSI20
Notes 1. The data of SI20 is loaded at the first falling edge of SCK20. Make sure that the master outputs
the first bit before the first falling of SCK20.
2. SO20 is high until SS20 rises after completion of DO0 output. When SS20 is high, SO20 is in a
high-impedance state.
244
CHAPTER 12 SERIAL INTERFACE 20
Figure 12-11. 3-Wire Serial I/O Mode Timing (5/7)
1 2
DI7 DI6
DO7 DO6
(ix) Slave operation (when DAP20 = 1, CKP20 = 0, SSE20 = 1)
1 2
DI7 DI6 DI5
DO7 DO6 DO5
User's Manual U15075EJ1V0UM00
3 4 5
DI5 DI4 DI3
DO5 DO4 DO3
3 4 5
DI4 DI3
DO4 DO3
6 7 8
DI2 DI1 DI0
DO2 DO1 DO0
6 7 8
DI2 DI1 DI0
DO2 DO1 DO0
Hi-Z
Note 2