Datasheet

Chapter 16 Debug Module (DBGV1) Block Description
MC9S12E256 Data Sheet, Rev. 1.10
496 Freescale Semiconductor
1
RWBEN
Read/Write Comparator B Enable Bit — The RWBEN bit controls whether read or write comparison is enabled
for comparator B. See Section 16.4.2.1.1, “Read or Write Comparison,” for more information. This bit is not useful
for tagged operations.
0 Read/Write is not used in comparison
1 Read/Write is used in comparison
0
RWB
Read/Write Comparator B Value Bit — The RWB bit controls whether read or write is used in compare for
comparator B. The RWB bit is not used if RWBEN = 0.
0 Write cycle will be matched
1 Read cycle will be matched
Note: RWB and RWBEN are not used in full mode.
Table 16-16. Breakpoint Mask Bits for First Address
BKAMBH:BKAMBL Address Compare DBGCAX DBGCAH DBGCAL
x:0 Full address compare Yes
1
1
If PPAGE is selected.
Ye s Ye s
0:1 256 byte address range Yes
1
Ye s N o
1:1 16K byte address range Yes
1
No No
Table 16-17. Breakpoint Mask Bits for Second Address (Dual Mode)
BKBMBH:BKBMBL Address Compare DBGCBX DBGCBH DBGCBL
x:0 Full address compare Yes
1
1
If PPAGE is selected.
Ye s Ye s
0:1 256 byte address range Yes
1
Ye s N o
1:1 16K byte address range Yes
1
No No
Table 16-18. Breakpoint Mask Bits for Data Breakpoints (Full Mode)
BKBMBH:BKBMBL Data Compare DBGCBX DBGCBH DBGCBL
0:0 High and low byte compare No
1
1
Expansion addresses for breakpoint B are not applicable in this mode.
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
Table 16-15. DBGC3 Field Descriptions (continued)
Field Description