MC9S12T64 Datasheet, PDF (556/608 Pages) Motorola, Inc – Specification

Breakpoint (BKP)
Freescale Semiconductor, Inc.
The 1:0 case is not sensible because it would ignore the high order
address and compare the low order and expansion addresses. Logic
forces this case to compare all address lines (effectively ignoring the
BK1MBH control bit).
The 1:1 case is useful for triggering a breakpoint on any access to a
particular expansion page. This only makes sense if a program page
is being accessed so that the breakpoint trigger will only occur if
BKP1X compares.
In Full Breakpoint Mode, these bits may be used to mask (disable) the
comparison of the high and/or low bytes of the data breakpoint. The
functionality is as given in Table 104 below.
Table 104 Breakpoint Mask Bits for Data Breakpoints (Full Breakpoint Mode)
BK1MBH:BK1MBL
Data Compare
BKP1X
0:0
High and Low Byte
Compare
No⁽¹⁾
0:1
High Byte
No⁽¹⁾
1:0
Low Byte
No⁽¹⁾
1:1
No Compare
No⁽¹⁾
1. Expansion addresses for breakpoint 1 are not available in this mode.
BKP1H
Yes
Yes
No
No
BKP1L
Yes
No
Yes
No
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.
1 = R/W is used in comparisons.
0 = R/W is not used in the 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.
1 = Read cycle will be matched
0 = Write cycle will be matched.
MC9S12T64Revision 1.1.1
Breakpoint (BKP)
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