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CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
User’s Manual U16228EJ2V0UD
334
15.3 Registers Controlling Serial Interfaces CSI10 and CSI11
Serial interfaces CSI10 and CSI11 are controlled by the following four registers.
Serial operation mode register 1n (CSIM1n)
Serial clock selection register 1n (CSIC1n)
Port mode register 0 (PM0) or port mode register 1 (PM1)
Port register 0 (P0) or port register 1 (P1)
(1) Serial operation mode register 1n (CSIM1n)
CSIM1n is used to select the operation mode and enable or disable operation.
CSIM1n can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Remark
n = 0:
μ
PD780131, 780132
n = 0, 1:
μ
PD780133, 780134, 78F0134, 780136, 780138, 78F0138
Figure 15-3. 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
0
DIR10
0
0
0
CSOT10
CSIE10
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
TRMD10
Note 4
Transmit/receive mode control
0
Note 5
Receive mode (transmission disabled).
1
Transmit/receive mode
DIR10
Note 6
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.
When using as a general-purpose port, see
Caution 3
of
Figure 15-5
and
Table 15-2
.
3.
Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
4.
Do not rewrite TRMD10 when CSOT10 = 1 (during serial communication).
5.
The SO10 output is fixed to the low level when TRMD10 is 0. Reception is started when data is read
from SIO10.
6.
Do not rewrite DIR10 when CSOT10 = 1 (during serial communication).
Caution Be sure to clear bit 5 to 0.