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Address: FFAFH After reset: 00H
Symbol
7
CSIM3
CSIE3
CSIE3
Shift register operation
0
Operation stop
1
Operation enable
MODE
0
Transmit/transmit and receive mode
1
Receive-only mode
SCL31
SCL30
0
0
1
1
Notes 1. When CSIE3 = 0 (SIO3 operation stop status), the SI3, SO3, and SCK3 pins can be used for port
functions.
2. When CSIE3 = 1 (SIO3 operation enabled status), the SI3 pin can be used as a port pin if only the
transmit function is used, and the SO3 pin can be used as a port pin if only the receive-only mode
is used.
Remarks 1. f
: Main system clock oscillation frequency
X
2. Figures in parentheses are for operation with f
CHAPTER 14 SERIAL INTERFACE SIO3
R/W
6
5
4
0
0
0
Enable/disable specification for SIO3
Clear
Count operation enable
Transfer operation modes and flags
Operation mode
Transfer start trigger
Write to SIO3
Read from SIO3
0
External clock input to SCK3
3
1
f
/2
(1.25 MHz)
X
5
0
f
/2
(312.5 kHz)
X
7
1
f
/2
(78.125 kHz)
X
User's Manual U15798EJ2V0UD
3
2
0
MODE
Serial counter
Port function
Serial function + port function
SO3/P21 pin function
SO3
P21
Clock selection
= 10 MHz.
X
1
0
SCL31
SCL30
Port
Note 1
Note 2
271
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