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CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
User’s Manual U16228EJ2V0UD
340
15.4 Operation of Serial Interfaces CSI10 and CSI11
Serial interfaces CSI10 and CSI11 can be used in the following two modes.
Operation stop mode
3-wire serial I/O mode
15.4.1 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, P11/SI10/R
X
D0, P12/SO10, P02/SO11
be used as ordinary I/O port pins in this mode.
Note
μ
PD780133, 780134, 78F0134, 780136, 780138, and 78F0138 only
(1) Register used
The operation stop mode is set by serial operation mode register 1n (CSIM1n).
To set the operation stop mode, clear bit 7 (CSIE1n) of CSIM1n to 0.
(a) Serial operation mode register 1n (CSIM1n)
CSIM1n can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM1n to 00H.
Remark
n = 0:
μ
PD780131, 780132
n = 0, 1:
μ
PD780133, 780134, 78F0134, 780136, 780138, 78F0138
Serial operation mode register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Note
, P03/SI11
Note
, and P04/SCK11
Note
pins can
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 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.
Serial operation mode register 11 (CSIM11)
Address: FF88H After reset: 00H R/W
Symbol
<7>
6
5
4
3
2
1
0
CSIM11
CSIE11
TRMD11
SSE11
DIR11
0
0
0
CSOT11
CSIE11
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 the SI11/P03, SO11/P02, SCK11/P04, and SSI11/TI001/P05 pins as general-purpose
port pins, see
CHAPTER 4 PORT FUNCTIONS
.
2.
Bit 0 (CSOT11) of CSIM11 and serial I/O shift register 11 (SIO11) are reset.