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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.
µ
Remark n = 0:
PD78F0132H
µ
n = 0, 1:
PD78F0133H, 78F0134H, 78F0136H, 78F0138H, 78F0138HD
Figure 15-3. Format of Serial Operation Mode Register 10 (CSIM10)
Address: FF80H After reset: 00H R/W
Symbol
<7>
CSIM10
CSIE10
CSIE10
0
1
Note 4
TRMD10
Note 5
0
1
Note 6
DIR10
0
1
CSOT10
0
1
Notes 1.
Bit 0 is a read-only bit.
2.
When using P10/SCK10/TxD0, P11/SI10/RxD0, and P12/SO10 as general-purpose port pins, see
CHAPTER 4 PORT FUNCTIONS, 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.
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
Note 1
6
5
TRMD10
0
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
MSB
LSB
Communication is stopped.
Communication is in progress.
User's Manual U16899EJ2V0UD
4
3
DIR10
0
Transmit/receive mode control
First bit specification
Communication status flag
2
1
0
0
0
CSOT10
Note 3
.
329
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