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CHAPTER 15 SERIAL INTERFACE SIO3
Preliminary User’s Manual U14581EJ3V0UM00
15.4 Serial Interface Operations
This section explains the two modes of the serial interface 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/SCK3, P51/SO3, and P52/SI3 pins can be used as normal I/O port pins.
(1) Register settings
Operation stop mode is set with the serial operation mode register 3 (CSIM3).
CSIM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM3 to 00H.
Address: FF84H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM3
CSIE3
0
0
0
0
MODE3
SCL31
SCL30
CSIE3
SIO3 Operation Enable/Disable Specification
Shift Register Operation
0
Operation disabled
1
Operation enabled
Caution
Bits 3 to 6 must be set to 0.
Summary of Contents for mPD780852 Series
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