341
SCR1—Serial control register 1
H'A0
SCI1
Bit
Initial value
Read/Write
7
SNC1
0
R/W
6
SNC0
0
R/W
5
—
0
R/W
4
—
0
R/W
3
CKS3
0
R/W
0
CKS0
0
R/W
2
CKS2
0
R/W
1
CKS1
0
R/W
Operation mode select
Clock source select
0
Clock source is prescaler S, and pin SCK is output pin
1
Clock source is external clock, and pin SCK is input pin
0
8-bit synchronous mode
16-bit synchronous mode
0
1
1
Continuous clock output mode
Reserved
0
1
Clock select
Bit 2
CKS2 CKS1 CKS0
Bit 1
Bit 0
0
ø/1024
ø/256
1
1
0
ø/64
ø/32
1
ø/16
1
0
0
1
ø/8
0
0
ø/4
1
0
1
ø/2
ø = 5 MHz
204.8
µ
s
51.2
µ
s
12.8
µ
s
6.4
µ
s
3.2
µ
s
1.6
µ
s
0.8
µ
s
—
ø = 2.5 MHz
409.6
µ
s
102.4
µ
s
25.6
µ
s
12.8
µ
s
6.4
µ
s
3.2
µ
s
1.6
µ
s
0.8
µ
s
Synchronous
Transfer Clock Cycle
1
1
Prescaler
Division