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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
this mode.
µ
Note
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>
CSIM10
CSIE10
CSIE10
0
Notes 1.
When using P10/SCK10(/TxD0
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.
µ
3.
PD78F0102H and 78F0103H only.
268
CHAPTER 13 SERIAL INTERFACE CSI10
Note
Note
D0
), P11/SI10(/R
D0
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
Note 3
Preliminary User's Manual U16846EJ1V0UD
), and P12/SO10 pins can be used as ordinary I/O port pins in
4
3
DIR10
0
Note 3
), P11/SI10(RxD0
), or P12/SO10 as general-purpose port
2
1
0
0
0
CSOT10
Note 2
.
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