mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 208

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

S12X Debug (S12XDBGV3) Module
Comparators B and D consist of four register bytes (three address bus compare registers and a control
register).
Each set of comparator registers is accessible in the same 8-byte window of the register address map and
can be accessed using the COMRV bits in the DBGC1 register. If the Comparators B or D are accessed
through the 8-byte window, then only the address and control bytes are visible, the 4 bytes associated with
data bus and data bus masking read as zero and cannot be written. Furthermore the control registers for
comparators B and D differ from those of comparators A and C.
6.3.2.8.1
The contents of this register bits 7 and 6 differ depending upon which comparator registers are visible in
the 8-byte window of the DBG module register address map.
Read: Anytime. See
Write: If DBG not armed. See
208
Address: 0x0028
Address: 0x0028
0x002C
0x002D
0x002A
0x002B
0x002E
0x002F
0x0028
0x0029
Reset
Reset
DBGXCTL[1] is reserved. Setting this bit maps the corresponding comparator to an
W
W
R
R
SZE
0
0
0
7
7
Debug Comparator Control Register (DBGXCTL)
Figure 6-13. Debug Comparator Control Register (Comparators A and C)
Figure 6-14. Debug Comparator Control Register (Comparators B and D)
DATA HIGH COMPARATOR
DATA LOW COMPARATOR
Table 6-26
= Unimplemented or Reserved
ADDRESS MEDIUM
DATA HIGH MASK
DATA LOW MASK
ADDRESS HIGH
ADDRESS LOW
NDB
SZ
0
0
6
6
CONTROL
Table 6-26
for visible register encoding.
Table 6-25. Comparator Register Layout
S12XS Family Reference Manual, Rev. 1.10
TAG
TAG
0
0
5
5
for visible register encoding.
WARNING
BRK
BRK
0
0
4
4
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
RW
RW
0
0
3
3
RWE
RWE
0
0
2
2
Comparator A and C only
Comparator A and C only
Comparator A and C only
Comparator A and C only
Comparators A,B,C,D
Comparators A,B,C,D
Comparators A,B,C,D
Comparators A,B,C,D
reserved
reserved
Freescale Semiconductor
0
0
1
1
COMPE
COMPE
0
0
0
0