Operation Of Serial Interface Csi10; Operation Stop Mode - NEC 78K0/KD1 Series User Manual

15.4 Operation of Serial Interface CSI10

Serial interface CSI10 can be used in the following two modes.

• Operation stop mode

• 3-wire serial I/O mode
15.4.1 Operation stop mode
Serial transfer is not executed in this mode. Therefore, the power consumption can be reduced. In addition, the
P10/SCK10/T D0, P11/SI10/R
X
(1) Register setting
The operation stop mode is set by serial operation mode register 10 (CSIM10).
(a) Serial operation mode register 10 (CSIM10)
CSIM10 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM10 to 00H.
Address: FF80H After reset: 00H R/W
Symbol 7
CSIM10 CSIE10
CSIE10
0
1
CHAPTER 15 SERIAL INTERFACE CSI10
D0, and P12/SO10 pins can be used as ordinary I/O port pins in this mode.
X
6 5
TRMD10 0
Operation control in 3-wire serial I/O mode
Stops operation (SI10/P11/R D0, SO10/P12, and SCK10/P10/T
X
purpose port pins).
Enables operation (SI10/P11/R
Preliminary User's Manual U16315EJ1V0UD
4 3
DIR10 0
D0, SO10/P12, and SCK10/P10/T
X
2 1 0
0 0 CSOT10
D0 pins can be used as general-
X
D0 pins are at active level).
X
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