104
BROMCRH and BROMCRL are 8-bit readable/writable registers used to make burst ROM
interface settings.
Area 1 and area 0 burst ROM interface settings can be made independently in BROMCRH and
BROMCRL, respectively.
BROMCRH and BROMCRL are initialized to H'0000 by a reset and in hardware standby mode.
They are not initialized in software standby mode.
Bit 7—Burst ROM Interface Select (BSRMn): Selects the burst ROM interface for area 0 or
area 1.
Bit 7
BSRMn
Description
0
Area n is basic bus interface space
(Initial value)
1
Area n is burst ROM interface space
(n = 1 or 0)
Bits 6 to 4—Burst Cycle Select (BSTSn2, BSTSn1, BSTSn0): These bits select the number of
burst cycle states.
Bit 6
BSTSn2
Bit 5
BSTSn1
Bit 4
BSTSn0
Description
0
0
0
Area n burst cycle comprises 1 state
(Initial value)
1
Area n burst cycle comprises 2 states
1
0
Area n burst cycle comprises 3 states
1
Area n burst cycle comprises 4 states
1
0
0
Area n burst cycle comprises 5 states
1
Area n burst cycle comprises 6 states
1
0
Area n burst cycle comprises 7 states
1
Area n burst cycle comprises 8 states
(n = 1 or 0)
Bits 3 and 2—Reserved: These are readable/writable bits, but the write value should always be 0.
Bits 1 and 0—Burst Word Length Select (BSWDn1, BSWDn0): These bits select the number
of words that can be burst-accessed on the burst ROM interface.
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