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CHAPTER 15 SERIAL INTERFACE CSI1
User’s Manual U15798EJ2V0UD
(b) Serial clock select register 1 (CSIC1)
This register is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets the value of this register to 10H.
Address: FFB1H After reset: 10H R/W
Symbol
7
6
5
4
3
2
1
0
CSIC1
0
0
0
CKP1
DAP1
CKS12
CKS11
CKS10
CKP1
DAP1
Data clock phase selection
Type
0
0
1
0
1
2
1
0
3
1
1
4
CKS12
CKS11
CKS10
Transfer clock CSI1 selection
0
0
0
f
X
/2
2
(2.5 MHz)
0
0
1
f
X
/2
3
(1.25 MHz)
0
1
0
f
X
/2
4
(625 kHz)
0
1
1
f
X
/2
5
(312.5 kHz)
1
0
0
f
X
/2
6
(156.25 kHz)
1
0
1
f
X
/2
7
(78.125 kHz)
1
1
0
f
X
/2
8
(39.0625 kHz)
1
1
1
External clock
Cautions 1.
When CSIE1 = 1 (operation enable) or when the P23/SI1, P24/SO1, and P25/SCK1 pins are
used as general-purpose ports, do not write to CSIC1.
2.
The phase type of the data clock is type 3 after reset.
Remark
Figures in parentheses are for operation with f
X
= 10 MHz
D7
D6
D5
D4
D3
D2
D1
D0
SCK1
SO1
SI1 input timing
D7
D6
D5
D4
D3
D2
D1
D0
SCK1
SO1
SI1 input timing
D7
D6
D5
D4
D3
D2
D1
D0
SCK1
SO1
SI1 input timing
D7
D6
D5
D4
D3
D2
D1
D0
SCK1
SO1
SI1 input timing