HD6432646 Hitachi, HD6432646 Datasheet - Page 184
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HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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7.2.4
BCRH is an 8-bit readable/writable register that selects enabling or disabling of idle cycle
insertion, and the memory interface for area 0.
BCRH is initialized to H'D0 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—Idle Cycle Insert 1 (ICIS1): Selects whether or not one idle cycle state is to be inserted
between bus cycles when successive external read cycles are performed in different areas.
Bit 7
ICIS1
0
1
Bit 6—Idle Cycle Insert 0 (ICIS0): Selects whether or not one idle cycle state is to be inserted
between bus cycles when successive external read and external write cycles are performed .
Bit 6
ICIS0
0
1
Bit 5—Burst ROM Enable (BRSTRM): Selects whether area 0 is used as a burst ROM
interface.
Bit 5
BRSTRM
0
1
150
Bit
Initial value
R/W
Bus Control Register H (BCRH)
Description
Idle cycle not inserted in case of successive external read cycles in different areas
Idle cycle inserted in case of successive external read cycles in different areas
Description
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
Description
Area 0 is basic bus interface
Area 0 is burst ROM interface
:
:
:
ICIS1
R/W
7
1
ICIS0
R/W
6
1
BRSTRM
R/W
5
0
BRSTS1
R/W
4
1
BRSTS0
R/W
3
0
R/W
—
2
0
R/W
—
1
0
(Initial value)
(Initial value)
(Initial value)
R/W
—
0
0
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