NEC PD78078 用户手册

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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

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.

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>

4

3

2

1

0

<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