Appendix B Internal I/O Registers
Rev.3.00 Jul. 19, 2007 page 475 of 532
REJ09B0397-0300
SCR1—Serial control register 1
H'A0
SCI1
(H8/3857 Group only)
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 transfer mode
16-bit synchronous transfer mode
1
0
1
0
1
Continuous clock output mode
Reserved
Clock Select (CKS2 to CKS0)
Bit 2
CKS2 CKS1 CKS0
Bit 1
Bit 0
0
φ
/1024
φ
/256
1
1
0
φ
/64
φ
/32
1
φ
/16
1
0
0
1
φ
/8
0
0
φ
/4
1
0
1
φ
/2
φ
= 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
⎯
φ
= 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
Serial Clock Cycle
1
1
Prescaler
Division
Summary of Contents for F-ZTAT H8 Series
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Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
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