h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 147

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

7.3.4
BCRH enables or disables idle cycle insertion and specifies the burst ROM interface.
Bit
7
6
5
4
3
2 to 0
Bit Name
ICIS1
ICIS0
BRSTRM
BRSTS1
BRSTS0
—
Bus Control Register H (BCRH)
Initial
Value
1
1
0
1
0
All 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Idle Cycle Insert 1
When consecutive external read cycles are performed
in different areas, an idle cycle can be inserted between
the bus cycles.
0: Idle cycle not inserted
1: Idle cycle inserted
Idle Cycle Insert 0
When an external read cycle and an external write cycle
are performed consecutively, an idle cycle can be
inserted between the bus cycles.
0: Idle cycle not inserted
1: Idle cycle inserted
Burst ROM Enable
Selects whether the burst ROM interface is used for
area 0.
0: Basic bus interface for area 0
1: Burst ROM interface for area 0
Burst Cycle Select 1
Selects the number of burst cycles for the burst ROM
interface.
0: 1 state for a burst cycle
1: 2 states for a burst cycle
Burst Cycle Select 0
Selects the number of words that can be accessed in a
burst access with the burst ROM interface.
0: Maximum four words in burst access
1: Maximum eight words in burst access
Reserved
The write value should always be 0.
Rev. 2.00 Dec. 05, 2005 Page 109 of 724
Section 7 Bus Controller (BSC)
REJ09B0200-0200