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16.4 Serial Interface Channel 0 Operations
The following four operating modes are available to the serial interface channel 0.
• Operation stop mode
• 3-wire serial I/O mode
• SBI mode
• 2-wire serial I/O mode
2
• I
C (Inter IC) bus mode
16.4.1 Operation stop mode
Serial transfer is not carried out in the operation stop mode. Thus, power dissipation can be reduced. The serial
I/O shift register 0 (SIO0) does not carry out shift operation either and thus it can be used as normal 8-bit register.
In the operation stop mode, the P25/SI0/SB0/SDA0, P26/SO0/SB1/SDA1 and P27/SCK0/SCL pins can be used
as normal input/output ports.
(1) Register setting
The operation stop mode is set with the 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>
CSIM0 CSIE0
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R/W
CSIE0
0
1
338
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 ( µ PD78014Y Subseries)
<6>
<5>
4
3
COI
WUP CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
Serial Interface Channel 0 Operation Control
Operation stopped
Operation enable
2
1
0
Address
FF60H
When Reset
R/W
00H
R/W
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