CHAPTER 11 SERIAL INTERFACE CSI10
Preliminary User’s Manual U19014EJ1V0UD
260
11.4 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
11.4.1 Operation stop mode
Serial communication is not executed in this mode. Therefore, the power consumption can be reduced. In
addition, the P10/SCK10, P11/SI10, and P12/SO10 pins can be used as ordinary I/O port pins in this 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 signal generation sets CSIM10 to 00H.
•
Serial operation mode register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1 0
CSIM10
CSIE10
TRMD10
0
DIR10
0 0 0
CSOT10
CSIE10
Operation control in 3-wire serial I/O mode
0
Disables
operation
Note 1
and asynchronously resets the internal circuit
Note 2
.
Notes 1.
To use P10/SCK10 and P12/SO10 as general-purpose ports, set CSIM10 in the default status
(00H).
2.
Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
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