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Figure 14-2. Format of Serial Operation Mode Register 30 (CSIM30)
Address: FFB0H After reset: 00H
Symbol
7
CSIM30
CSIE30
CSIE30
Shift register operation
0
Operation disabled
1
Operation enabled
MODE0
0
Transmit/transmit and receive mode
1
Receive-only mode
SCL301
SCL300
0
0
1
1
Notes 1. When CSIE30 = 0 (SIO30 operation stop status), the pins SI30, SO30, and SCK30 can be used for
port functions.
2. When CSIE30 = 1 (SIO30 operation enabled status), the SI30 pin can be used as a port pin if only
the transmit function is used, and the SO30 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 SIO30
Clear
Count operation enabled
Transfer operation modes and flags
Operation mode
Transfer start trigger
Write to SIO30
Read from SIO30
0
External clock input to SCK30
3
1
f
/2
(1.05 MHz)
X
4
0
f
/2
(524 kHz)
X
5
1
f
/2
(262 kHz)
X
Preliminary User's Manual U16035EJ1V0UM
3
2
0
MODE0
Serial counter
Port function
Serial function + port function
Normal output
Fixed at low level
Clock selection
= 8.38 MHz.
X
1
0
SCL301
SCL300
Port
Note 1
Note 2
SO30 output
239
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