CHAPTER 13 SERIAL INTERFACE CSI10
Preliminary User’s Manual U16846EJ1V0UD
268
13.4 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
13.4.1 Operation stop mode
Serial communication is not executed in this mode. Therefore, the power consumption can be reduced. In
addition, the P10/SCK10(/T
X
D0
Note
), P11/SI10(/R
X
D0
Note
), and P12/SO10 pins can be used as ordinary I/O port pins in
this mode.
Note
µ
PD78F0102H and 78F0103H only.
(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>
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. When using P10/SCK10(/TxD0
Note 3
), P11/SI10(RxD0
Note 3
), or P12/SO10 as general-purpose port
pins, see CHAPTER 4 PORT FUNCTIONS and Caution 3 of Figure 13-3.
2. Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
3.
µ
PD78F0102H and 78F0103H only.