MC9S12GRMV1 Datasheet, PDF (326/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet

S12S Debug Module (S12SDBGV2)
Read: DBGACTL if COMRV[1:0] = 00
DBGBCTL if COMRV[1:0] = 01
DBGCCTL if COMRV[1:0] = 10
Write: DBGACTL if COMRV[1:0] = 00 and DBG not armed
DBGBCTL if COMRV[1:0] = 01 and DBG not armed
DBGCCTL if COMRV[1:0] = 10 and DBG not armed
Table 8-22. DBGXCTL Field Descriptions
Field
Description
7
SZE
(Comparators
A and B)
Size Comparator Enable Bit — The SZE bit controls whether access size comparison is enabled for the
associated comparator. This bit is ignored if the TAG bit in the same register is set.
0 Word/Byte access size is not used in comparison
1 Word/Byte access size is used in comparison
6
SZ
(Comparators
A and B)
Size Comparator Value Bit — The SZ bit selects either word or byte access size in comparison for the
associated comparator. This bit is ignored if the SZE bit is cleared or if the TAG bit in the same register is set.
0 Word access size is compared
1 Byte access size is compared
5
Tag Select— This bit controls whether the comparator match has immediate effect, causing an immediate
TAG
state sequencer transition or tag the opcode at the matched address. Tagged opcodes trigger only if they
reach the execution stage of the instruction queue.
0 Allow state sequencer transition immediately on match
1 On match, tag the opcode. If the opcode is about to be executed allow a state sequencer transition
4
BRK
Break— This bit controls whether a comparator match terminates a debug session immediately, independent
of state sequencer state. To generate an immediate breakpoint the module breakpoints must be enabled
using the DBGC1 bit DBGBRK.
0 The debug session termination is dependent upon the state sequencer and trigger conditions.
1 A match on this channel terminates the debug session immediately; breakpoints if active are generated,
tracing, if active, is terminated and the module disarmed.
3
Read/Write Comparator Value Bit — The RW bit controls whether read or write is used in compare for the
RW
associated comparator. The RW bit is not used if RWE = 0. This bit is ignored if the TAG bit in the same
register is set.
0 Write cycle is matched1Read cycle is matched
2
RWE
Read/Write Enable Bit — The RWE bit controls whether read or write comparison is enabled for the
associated comparator.This bit is ignored if the TAG bit in the same register is set
0 Read/Write is not used in comparison
1 Read/Write is used in comparison
1
NDB
(Comparator A)
Not Data Bus — The NDB bit controls whether the match occurs when the data bus matches the comparator
register value or when the data bus differs from the register value. This bit is ignored if the TAG bit in the same
register is set. This bit is only available for comparator A.
0 Match on data bus equivalence to comparator register contents
1 Match on data bus difference to comparator register contents
0
COMPE
Determines if comparator is enabled
0 The comparator is not enabled
1 The comparator is enabled
Table 8-23 shows the effect for RWE and RW on the comparison conditions. These bits are ignored if the
corresponding TAG bit is set since the match occurs based on the tagged opcode reaching the execution
stage of the instruction queue.
MC9S12G Family Reference Manual, Rev.1.23
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