HD6432670 Hitachi, HD6432670 Datasheet - Page 179

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

6.3.6
BROMCRH and BROMCRL are used to make burst ROM interface settings. Area 0 and area 1
burst ROM interface settings can be made independently in BROMCRH and BROMCRL,
respectively.
Bit
7
6
5
4
3
2
1
0
Bit Name
BSRMn
BSTSn2
BSTSn1
BSTSn0
BSWDn1
BSWDn0
Area 0 Burst ROM Interface Control Register (BROMCRH)
Area 1 Burst ROM Interface Control Register (BROMCRL)
Initial Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Burst ROM Interface Select
Selects the basic bus interface or burst ROM
interface.
0: Basic bus interface space
1: Burst ROM interface space
Burst Cycle Select
These bits select the number of burst cycle
states.
000: 1 state
001: 2 states
010: 3 states
011: 4 states
100: 5 states
101: 6 states
110: 7 states
111: 8 states
Reserved
These bits are always read as 0. The initial
value should not be changed.
Burst Word Number Select
These bits select the number of words that can
be burst-accessed on the burst ROM interface.
00: Maximum 4 words
01: Maximum 8 words
10: Maximum 16 words
11: Maximum 32 words
Rev. 2.0, 04/02, page 133 of 906
(n = 1 or 0)