Operation Of Serial Interfaces Csi10 And Csi11; Operation Stop Mode - NEC 78K0 User Manual

16.4 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
16.4.1 Operation stop mode
Serial communication is not executed in this mode. Therefore, the power consumption can be reduced. In
addition, the P10/SCK10/T
be used as ordinary I/O port pins in this mode.
µ
Note PD780146, 780148, and 78F0148 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:
n = 0, 1:
• Serial operation mode register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Symbol <7>
CSIM10 CSIE10
CSIE10
0
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>
CSIM11 CSIE11
CSIE11
0
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.
CHAPTER 16 SERIAL INTERFACES CSI10 AND CSI11
D0, P11/SI10/R D0, P12/SO10, P02/SO11
X X
µ
PD780143, 780144
µ
PD780146, 780148, 78F0148
6 5
TRMD10 0
Operation control in 3-wire serial I/O mode
Note 1
Disables operation and asynchronously resets the internal circuit
6 5
TRMD11 SSE11
Operation control in 3-wire serial I/O mode
Note 1
Disables operation and asynchronously resets the internal circuit
User's Manual U15947EJ2V0UD
Note
, P03/SI11
*
4 3
DIR10 0
4 3
DIR11 0
Note Note
, and P04/SCK11 pins can
2 1 0
0 0 CSOT10
Note 2
.
2 1 0
0 0 CSOT11
Note 2
.
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