Operating Mode Settings Of Serial Interface 10 - NEC switch User Manual

(1) Operation stop mode
CSIM10 PM22
CSIE10 DIR10 CSCK10
× × × Note 1
0
Other than above
(2) 3-wired serial I/O mode
CSIM10 PM22
CSIE10 DIR10 CSCK10
Note 2
1 0 0 1
1
1 1 0
1
Other than above
Notes 1. Can be used as port function.
2. If used only for transmission, can be used as P22 (CMOS input/output).
×: don't care
Remark
158
CHAPTER 9 SERIAL INTERFACE 10
Table 9-2. Operating Mode Settings of Serial Interface 10
P22 PM21 P21 PM20
× Note 1 × Note 1 × Note 1 × Note 1
P22 PM21 P21 PM20
×
Note 2
0 1 1
0
1
0
User's Manual U12978EJ3V0UD
P20 Start Shift P22/SI10
Bit Clock Pin Function
× Note 1
— — P22
Setting prohibited
P20 Start Shift P22/SI10
Bit Clock Pin Function
×
Note 2
MSB External SI10
clock
1 Internal
clock
×
LSB External
clock
1 Internal
clock
Setting prohibited
P21/SO10 P20/SCK10
Pin Function Pin Function
P21 P20
P21/SO10 P20/SCK10
Pin Function Pin Function
SO10 SCK10 input
(CMOS output)
SCK10 output
SCK10 input
SCK10 output