CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
249
10.2.3 Operations
CSIn has the following two operation modes.
•
Operation stop mode
•
3-wire serial I/O mode
(1) Operation stop mode
This mode does not perform serial transfers and can therefore reduce power consumption.
When in operation stop mode, if SIn, SOn, and SCKn pin are also used as I/O ports, they can be used as normal
I/O ports as well.
(a) Register settings
Operation stop mode are set via the CSIEn bit of serial operation mode register n (CSIMn).
Figure 10-4. CSIMn Setting (Operation Stop Mode)
After reset : 00H
R/W
Address: CSIM0
FFFFF2A2H
CSIM1
FFFFF2B2H
CSIM2
FFFFF2C2H
CSIM3
FFFFF2D2H
7
6
5
4
3
2
1
0
CSIMn
CSIEn
0
0
0
0
MODEn
SCLn1
SCLn0
(n = 0 to 3)
SIOn operation enable/disable specification
CSIEn
Shift register operation
Serial counter
Port
0
Operation disable
Clear
Port function
Содержание MPD703030A
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