h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 995

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

BCR—Bus Control Register
Bit
Initial value
Read/Write
Reserved
ICIS1
R/W
7
1
Idle cycle insert 0
0
1
ICIS0
Idle cycle not inserted in case of successive
external read and external write cycles
Idle cycle inserted in case of successive
external read and external write cycles
Burst ROM enable
R/W
0
1
6
1
Basic bus interface
Burst ROM interface
Burst cycle select 1
0
1
BRSTRM
R/W
Burst cycle comprises 1 state
Burst cycle comprises 2 states
Burst cycle select 0
5
0
0
1
Note: * In the H8S/2138 F-ZTAT A-mask version, the address
Max. 4 words in burst access
Max. 8 words in burst access
IOS select
BRSTS1
IOS1
0
1
R/W
4
1
IOS0
range is from H'(FF)F000 to H'(FF)F7FF.
0
1
0
1
BRSTS0
R/W
Rev. 4.00 Jun 06, 2006 page 941 of 1004
Addresses for which AS/IOS is low
output when IOSE = 1
Low output when accessing addresses
H'(FF)F000 to H'(FF)F03F
Low output when accessing addresses
H'(FF)F000 to H'(FF)F0FF
Low output when accessing addresses
H'(FF)F000 to H'(FF)F3FF
Low output when accessing addresses
H'(FF)F000 to H'(FF)FE4F *
H'FFC6
3
0
Appendix B Internal I/O Registers
R/W
—
2
1
IOS1
R/W
1
1
REJ09B0301-0400
Bus Controller
IOS0
R/W
0
1