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CHAPTER 14 SERIAL INTERFACE SIO2
Preliminary User’s Manual U14581EJ3V0UM00
14.4 Serial Interface Operations
This section explains the two modes of the serial interface SIO2.
14.4.1 Operation stop mode
This mode is used when serial transfers are not performed to reduce power consumption.
In addition, in this mode, the P03/SCK2, P04/SO2, and P05/SI2 pins can be used as normal I/O port pins.
(1) Register setting
The operation stop mode is set with the serial operation mode register 2 (CSIM2).
CSIM2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM2 to 00H.
Address: FF98H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM2
CSIE2
0
0
CLPH
CLPO
MODE2
SCL21
SCL20
CSIE2
SIO2 Operation Enable/Disable Specification
Shift Register Operation
Serial Counter
Port
0
Operation disabled
Clear
Port function
1
Operation enabled
Counter operation enabled Serial fu port function
Содержание mPD780851
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