Operation Of Serial Interfaces Csi10 And Csi11; Operation Stop Mode - NEC 78K0 Series User Manual
8-bit single-chip microcontrollers
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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.
Note Available only in the
(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 signal generation sets CSIM1n to 00H.
µ
Remark n = 0:
PD78F0531, 78F0532, 78F0533
µ
n = 0, 1:
PD78F0534, 78F0535, 78F0536, 78F0537, 78F0537D
• Serial operation mode register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Symbol
<7>
CSIM10
CSIE10
CSIE10
0
Notes 1.
To use P10/SCK10/T
status (00H).
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 P02/SO11, P04/SCK11, and P05/SSI11/TI001 as general-purpose ports, set CSIM11 in
the default status (00H).
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
PD78F0534, 78F0535, 78F0536, 78F0537, 78F0537D
6
5
TRMD10
0
Operation control in 3-wire serial I/O mode
Note 1
Disables operation
and asynchronously resets the internal circuit
D0 and P12/SO10 as general-purpose ports, set CSIM10 in the default
X
6
5
TRMD11
SSE11
Operation control in 3-wire serial I/O mode
Note 1
Disables operation
and asynchronously resets the internal circuit
Preliminary User's Manual U17260EJ3V1UD
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
.
393
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