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CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78054Y Subseries)
17.4 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
• 2-wire serial I/O mode
•I
2
C (Inter IC) bus mode
17.4.1 Operation stop mode
Serial transfer is not carried out in the operation stop mode. Thus, power consumption 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 ordinary 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 general 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.
<6><5>43210<7>
Symbol
CSIM0 CSIE0 COI WUP
CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
FF60H 00H R/W
Address After Reset R/W
CSIE0
0
Serial Interface Channel 0 Operation Control
Operation stopped
Operation enabled
R/W
1
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