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CHAPTER 15 SERIAL INTERFACE CSI10
User’s Manual U19780EJ2V0UD
405
Figure 15-2. Format of Serial Operation Mode Register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Note 1
Symbol
<7>
6 5 4 3 2 1 0
CSIM10 CSIE10 TRMD10
SSE10
Note 2
DIR10
0
0
0
CSOT10
CSIE10
Operation control in 3-wire serial I/O mode
0
Disables
operation
Note 3
and asynchronously resets the internal circuit
Note 4
.
1
Enables
operation
TRMD10
Note 5
Transmit/receive
mode
control
0
Note 6
Receive mode (transmission disabled).
1
Transmit/receive
mode
SSE10
Notes 7, 8
SSI10 pin use selection
0
SSI10 pin is not used
1
SSI10 pin is used
DIR10
Note 9
First
bit
specification
0
MSB
1
LSB
CSOT10
Communication
status
flag
0
Communication is stopped.
1
Communication is in progress.
Notes 1.
Bit 0 is a read-only bit.
2.
78K0/KC2-A
only.
3.
To use P60/SCK10/SCLA0, P31/INTP5/OCD1A/SCK10, and P35/SO10/INTP1 as general-purpose
ports, set CSIM10 in the default status (00H).
4.
Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
5.
Do not rewrite TRMD10 when CSOT10 = 1 (during serial communication).
6.
The SO10 output (refer to
Figure 15-1
) is fixed to the low level when TRMD10 is 0. Reception is
started when data is read from SIO10.
7.
Do not rewrite SSE10 when CSOT10 = 1 (during serial communication).
8.
Before setting this bit to 1, fix the SSI10 pin input level to 0 or 1.
9.
Do not rewrite DIR10 when CSOT10 = 1 (during serial communication).