h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 187
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h8s-2158
Manufacturer Part Number
h8s-2158
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2158.pdf
(927 pages)
- Current page: 187 of 927
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Section 6 Bus Controller
6.6.1
Basic Operation Timing
The number of access states in the initial cycle (full access) of the burst ROM interface is
determined by the AST bit in WSCR. When the AST bit is set to 1, wait states can be inserted. 1
or 2 states can be selected for burst access according to the setting of the BRSTS1 bit in BCR.
Wait states cannot be inserted in a burst cycle. Burst accesses of a maximum four words is
performed when the BRSTS0 bit in BCR is cleared to 0, and burst accesses of a maximum eight
words is performed when the BRSTS0 bit in BCR is set to 1.
The basic access timing for the burst ROM space is shown in figures 6.14 and 6.15.
Full access
Burst access
T
T
T
T
T
T
T
1
2
3
1
2
1
2
Address bus
Only lower address changes
AS/IOS
(IOSE = 0)
RD
Data bus
Read data
Read data
Read data
Figure 6.14 Access Timing Example in Burst ROM Space (AST = BRSTS1 = 1)
Rev. 3.00 Jan 25, 2006 page 135 of 872
REJ09B0286-0300
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