sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 204

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

S12S Debug Module (S12SDBGV2)
6.3.2.8.8
Read: If COMRV[1:0] = 00
Write: If COMRV[1:0] = 00 and DBG not armed.
6.4
This section provides a complete functional description of the DBG module. If the part is in secure mode,
the DBG module can generate breakpoints but tracing is not possible.
6.4.1
Arming the DBG module by setting ARM in DBGC1 allows triggering the state sequencer, storing of data
in the trace buffer and generation of breakpoints to the CPU. The DBG module is made up of four main
blocks, the comparators, control logic, the state sequencer, and the trace buffer.
The comparators monitor the bus activity of the CPU. All comparators can be configured to monitor
address bus activity. Comparator A can also be configured to monitor databus activity and mask out
individual data bus bits during a compare. Comparators can be configured to use R/W and word/byte
access qualification in the comparison. A match with a comparator register value can initiate a state
sequencer transition to another state (see
204
Address: 0x002F
Bits[15:8]
Bits[7:0]
Reset
Field
Field
7–0
7–0
W
R
Functional Description
S12SDBG Operation
Comparator Data High Mask Bits — The Comparator data high mask bits control whether the selected
comparator compares the data bus bits [15:8] to the corresponding comparator data compare bits. Data bus
comparisons are only performed if the TAG bit in DBGACTL is clear
0 Do not compare corresponding data bit Any value of corresponding data bit allows match.
1 Compare corresponding data bit
Bit 7
Comparator Data Low Mask Bits — The Comparator data low mask bits control whether the selected
comparator compares the data bus bits [7:0] to the corresponding comparator data compare bits. Data bus
comparisons are only performed if the TAG bit in DBGACTL is clear
0 Do not compare corresponding data bit. Any value of corresponding data bit allows match
1 Compare corresponding data bit
0
7
Debug Comparator Data Low Mask Register (DBGADLM)
Figure 6-22. Debug Comparator Data Low Mask Register (DBGADLM)
Bit 6
0
6
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Table 6-30. DBGADHM Field Descriptions
Table 6-31. DBGADLM Field Descriptions
Bit 5
0
5
Figure
6-24). Either forced or tagged matches are possible. Using
Bit 4
0
4
Description
Description
Bit 3
0
3
Bit 2
0
2
Freescale Semiconductor
Bit 1
0
1
Bit 0
0
0