UPD78F0138 NEC, UPD78F0138 Datasheet - Page 340

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

15.4 Operation of Serial Interfaces CSI10 and CSI11
15.4.1 Operation stop mode
addition, the P10/SCK10/T
be used as ordinary I/O port pins in this mode.
(1) Register used
340
Address: FF80H After reset: 00H R/W
Address: FF88H After reset: 00H R/W
CSIM10
CSIM11
Serial interfaces CSI10 and CSI11 can be used in the following two modes.
• Operation stop mode
• 3-wire serial I/O mode
Serial communication is not executed in this mode. Therefore, the power consumption can be reduced. In
Note
Symbol
Symbol
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:
• Serial operation mode register 10 (CSIM10)
Notes 1.
• Serial operation mode register 11 (CSIM11)
Notes 1.
µ
PD780133, 780134, 78F0134, 780136, 780138, and 78F0138 only
CSIE10
CSIE11
CSIE10
2.
CSIE11
2.
<7>
<7>
0
0
n = 0, 1:
To use the SI10/RxD0/P11, SO10/P12, and SCK10/TxD0/P10 pins as general-purpose port pins,
see CHAPTER 4 PORT FUNCTIONS.
Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
To use the SI11/P03, SO11/P02, SCK11/P04, and SSI11/TI001/P05 pins as general-purpose
port pins, see CHAPTER 4 PORT FUNCTIONS.
Bit 0 (CSOT11) of CSIM11 and serial I/O shift register 11 (SIO11) are reset.
Disables operation
Disables operation
X
D0, P11/SI10/R
TRMD10
TRMD11
µ
µ
PD780131, 780132
PD780133, 780134, 78F0134, 780136, 780138, 78F0138
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
6
6
SSE11
Note 1
Note 1
X
5
0
5
D0, P12/SO10, P02/SO11
User’s Manual U16228EJ2V0UD
and asynchronously resets the internal circuit
and asynchronously resets the internal circuit
Operation control in 3-wire serial I/O mode
Operation control in 3-wire serial I/O mode
DIR10
DIR11
4
4
3
0
3
0
Note
, P03/SI11
2
0
2
0
Note
Note 2
Note 2
, and P04/SCK11
.
.
1
0
1
0
Note
CSOT10
CSOT11
pins can
0
0