CHAPTER 12 SERIAL INTERFACE 20
User’s Manual U15075EJ2V1UD
247
Figure 12-11. 3-Wire Serial I/O Mode Timing (4/7)
(vi) Slave operation (when DAP20 = 0, CKP20 = 1, SSE20 = 1)
1
2
3
4
5
6
7
8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
Note 2
SCK20
SI20
Hi-Z
Hi-Z
SO20
SIO20
write
SS20
INTCSI20
DO0
SIO20 write (master)
Note 1
Notes 1.
The data of SI20 is loaded at the first rising edge of SCK20. Make sure that the master outputs
the first bit before the first rising 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.
(vii) Master operation (when DAP20 = 1, CKP20 = 0, SSE20 = 0)
1
2
3
4
5
6
7
8
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
SCK20
SO20
SI20
SIO20
write
INTCSI20
Содержание UPD789426 Series
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