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

14.4 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
14.4.1 Operation stop mode
Serial communication is not executed in this mode. Therefore, the power consumption can be reduced. In
addition, the P10/SCK10/T
mode.
(1) Register used
The operation stop mode is set by serial operation mode register 10 (CSIM10).
To set the operation stop mode, clear bit 7 (CSIE10) of CSIM10 to 0.
(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
Notes 1. To use the SI10/RxD0/P11, SO10/P12, and SCK10/TxD0/P10 pins as general-purpose port pins,
see CHAPTER 4 PORT FUNCTIONS.
2. Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
304
CHAPTER 14 SERIAL INTERFACE CSI10
D0, P11/SI10/R D0, and P12/SO10 pins can be used as ordinary I/O port pins in this
X X
6 5
TRMD10 0
Operation control in 3-wire serial I/O mode
Note 1
Disables operation and asynchronously resets the internal circuit
User's Manual U16227EJ2V0UD
4 3
DIR10 0
2 1 0
0 0 CSOT10
Note 2
.