Format Of Serial Operation Mode Register 11 (Csim11) - NEC 78K0 User Manual

Figure 16-4. Format of Serial Operation Mode Register 11 (CSIM11)
Address: FF88H After reset: 00H R/W
Symbol <7>
CSIM11 CSIE11
CSIE11
0
1
Note 4
TRMD11
Note 5
0
1
Notes 6, 7
SSE11
0
1
Note 8
DIR11
0
1
CSOT11
0
1
Notes 1. Bit 0 is a read-only bit.
2. When using as a general-purpose port, see Caution 3 of Figure 16-6 and Table 16-2.
3. Bit 0 (CSOT11) of CSIM11 and serial I/O shift register 11 (SIO11) are reset.
4. Do not rewrite TRMD11 when CSOT11 = 1 (during serial communication).
5. The SO11 output is fixed to the low level when TRMD11 is 0. Reception is started when data is read
from SIO11.
6. Do not rewrite SSE11 when CSOT11 = 1 (during serial communication).
7. Before setting this bit to 1, fix the SSI11 pin input level to 0 or 1.
8. Do not rewrite DIR11 when CSOT11 = 1 (during serial communication).
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CHAPTER 16 SERIAL INTERFACES CSI10 AND CSI11
Note 1
6 5
TRMD11 SSE11
Operation control in 3-wire serial I/O mode
Note 2
Disables operation and asynchronously resets the internal circuit
Enables operation
Receive mode (transmission disabled).
Transmit/receive mode
SSI11 pin is not used
SSI11 pin is used
MSB
LSB
Communication is stopped.
Communication is in progress.
User's Manual U15947EJ2V0UD
4 3
DIR11 0
Transmit/receive mode control
SSI11 pin use selection
First bit specification
*
Communication status flag
2 1 0
0 0 CSOT11
Note 3
.