Datasheet

78K0/Ix2 CHAPTER 16 SERIAL INTERFACE CSI11
R01UH0010EJ0500 Rev.5.00 552
Feb 28, 2012
Figure 16-2. Format of Serial Operation Mode Register 11 (CSIM11)
Address: FF88H After reset: 00H R/W
Note 1
Symbol <7> 6 5 4 3 2 1 0
CSIM11 CSIE11 TRMD11 SSE11 DIR11 0 0 0 CSOT11
CSIE11 Operation control in 3-wire serial I/O mode
0 Disables operation
Note 2
and asynchronously resets the internal circuit
Note 3
.
1 Enables operation
TRMD11
Note 4
Transmit/receive mode control
0
Note 5
Receive mode (transmission disabled).
1 Transmit/receive mode
SSE11
Notes 6, 7
SSI11 pin use selection
0 SSI11 pin is not used
1 SSI11 pin is used
DIR11
Note 8
First bit specification
0 MSB
1 LSB
CSOT11 Communication status flag
0 Communication is stopped.
1 Communication is in progress.
Notes 1. Bit 0 is a read-only bit.
2. To use P37/SO11, P35/SCK11, and P20/SSI11/INTP5 as general-purpose ports, set CSIM11 in the default
status (00H).
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 (refer to Figure 16-1) 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).
(2) Serial clock selection register 11 (CSIC11)
This register specifies the timing of the data transmission/reception and sets the serial clock.
CSIC11 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.