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12.4 Serial Interface 1A0 Operation
Serial interface 1A0 provides the following three modes.
• Operation stop mode
• 3-wire serial I/O mode
• 3-wire serial I/O mode with automatic transmit/receive function
12.4.1 Operation stop mode
In operation stop mode, serial transfer is not executed, thereby reducing the power consumption. The P23/SCK10,
P24/SO10, and P25/SI10 pins can be used as normal I/O ports.
(1)
Register setting
Operation stop mode is set by serial operation mode register 1A0 (CSIM1A0).
(a) Serial operation mode register 1A0 (CSIM1A0)
CSIM1A0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM1A0 to 00H.
Symbol
<7>
6
CSIM1A0
CSIE10
DIR10
CSIE10
Shift register operation
0
Operation stopped
1
Operation enabled
Note When CSIE10 = 0 (SIO1A0 operation stop status), the SCK10/P23, SO10/P24, and SI10/P25 pins can
freely be used as port pins.
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CHAPTER 12 SERIAL INTERFACE 1A0
<5>
<4>
3
ATE0
LSCK10
0
Specification of operation enable/disable
Cleared
Count operation enabled
User's Manual U15331EJ4V1UD
2
1
0
0
SCL101
SCL100
Serial counter
Port function
Serial function + port function
Address
After reset
R/W
FF78H
00H
R/W
Note
Port
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