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SCR1—Serial control register 1
Bit
SNC1
Initial value
Read/Write
R/W
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
Operation mode select
0
0
8-bit synchronous transfer mode
1
16-bit synchronous transfer mode
1
0
Continuous clock output mode
1
Reserved
7
6
5
⎯
SNC0
0
0
0
R/W
R/W
Clock Select (CKS2 to CKS0)
Bit 2
Bit 1
CKS2 CKS1 CKS0
0
0
1
1
0
1
Appendix B Internal I/O Registers
4
3
⎯
CKS3
0
0
R/W
R/W
Bit 0
Prescaler
φ = 5 MHz
Division
φ/1024
204.8 μs
0
φ/256
51.2 μs
1
φ/64
12.8 μs
0
φ/32
6.4 μs
1
φ/16
3.2 μs
0
φ/8
1.6 μs
1
φ/4
0.8 μs
0
φ/2
⎯
1
Rev.3.00 Jul. 19, 2007 page 475 of 532
H'A0
(H8/3857 Group only)
2
1
CKS2
CKS1
0
0
R/W
R/W
Serial Clock Cycle
Synchronous
φ = 2.5 MHz
409.6 μs
102.4 μs
25.6 μs
12.8 μs
6.4 μs
3.2 μs
1.6 μs
0.8 μs
1
1
REJ09B0397-0300
SCI1
0
CKS0
0
R/W
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