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13.4 Operations of Serial Interface Channel 0
The following four operating modes are available for serial interface channel 0.
• Operation stop mode
• 3-wire serial I/O mode
• SBI mode
• 2-wire serial I/O mode
13.4.1 Operation stop mode
Serial transfer is not carried out in the operation stop mode. Thus, power consumption can be reduced. Serial
I/O shift register 0 (SIO0) does not carry out shift operations and can be used as an ordinary 8-bit register.
In the operation stop mode, the P25/SI0/SB0, P26/SO0/SB1, and P27/SCK0 pins can be used as ordinary
I/O ports.
(1) Register setting
The operation stop mode is set by serial operating mode register 0 (CSIM0).
CSIM0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.
Symbol
<7>
<6>
<5>
CSIM0 CSIE0 COI
WUP
R/W
CSIE0
Serial interface channel 0 operation control
0
Operation stopped
1
Operation enabled
CHAPTER 13 SERIAL INTERFACE CHANNEL 0
4
3
2
1
CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
User's Manual U11302EJ4V0UM
0
Address
After reset
FF60H
00H
R/W
R/W
217
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