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CHAPTER 15 SERIAL INTERFACE SIO3
15.4 SIO3 Operations
This section explains the two modes of the SIO3.
15.4.1 Operation stop mode
This mode is used when serial transfers are not performed to reduce power consumption.
In the operation stop mode, the P50/SCK, P51/SO, and P52/SI pins can be used as normal I/O ports as well.
(1) Register settings
Operation stop mode are set via serial operation mode register (CSIM).
CSIM is set with a 1-bit or 8-bit memory manipulation instruction.
The RESET input resets the value to 00H.
Figure 15-3. Serial Operation Mode Register (CSIM) Format
Address: FF84H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM
CSIE
0
0
0
0
MODE
SCL1
SCL0
CSIE
SIO3 Operation Enable/Disable Specification
Shift Register Operation
0
Operation disable
1
Operation enable
Caution
Bits 3 to 6 must be set to 0.
Содержание mPD780973 Series
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