Datasheet

Breakpoint (BKP) Module
MC9S12DP256 — Revision 1.1
Breakpoint (BKP) Module
In Full Mode, these bits may be used to mask (disable) the
comparison of the high and/or low bytes of the data breakpoint. (See
Table 126.).
BK0RWE — R/W
Compare Enable
Enables the comparison of the R/W
signal for first address
breakpoint. This bit is not useful in tagged breakpoints.
0 = R/W
is not used in the comparisons.
1 = R/W
is used in comparisons.
BK0RW— R/W
Compare Value
When BK0RWE=1, this bit determines the type of bus cycle to match
on first address breakpoint. When BK0RWE=0, this bit has no effect.
0 = Write cycle will be matched.
1 = Read cycle will be matched
BK1RWE — R/W
Compare Enable
In Dual Mode, this bit enables the comparison of the R/W
signal to
further specify what causes a match for the second address
breakpoint. This bit is not useful on tagged breakpoints or in Full Mode
and is therefore a don’t care.
0 = R/W
is not used in comparisons.
1 = R/W
is used in comparisons.
Table 126 Breakpoint Mask Bits for Data Breakpoints (Full Mode)
BK1MBH:BK1MBL Data Compare BKP1X BKP1H BKP1L
0:0
High and Low Byte
Compare
No
(1)
Ye s Ye s
0:1 High Byte
No
(1)
Ye s N o
1:0 Low Byte
No
(1)
No Yes
1:1 No Compare
No
(1)
No No
1. Expansion addresses for breakpoint 1 are not available in this mode.
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