Datasheet
Chapter 5. Debug Support 5-15
Programming Model
NOTE:
The debug module has no hardware interlocks, so to prevent
spurious breakpoint triggers while the breakpoint registers are
being loaded, disable TDR (by clearing TDR[29,13] before
defining triggers.
A write to TDR clears the CSR trigger status bits, CSR[BSTAT].
Section Table 5-14., “TDR Field Descriptions,” describes how to handle multiple
breakpoint conditions.
Table 5-14 describes TDR fields.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Field TRC EBL EDLW EDWL EDWU EDLL EDLM EDUM EDUU DI EAI EAR EAL EPC PCI
Reset 0000_0000_0000_0000
15141312 11 10 9 8 7 6 543210
Field LxT EBL EDLW EDWL EDWU EDLL EDLM EDUM EDUU DI EAI EAR EAL EPC PCI
Reset 0000_0000_0000_0000
R/W Write only. Accessible in supervisor mode as debug control register 0x07 using the WDEBUG instruction and
through the BDM port using the
WDMREG command.
DRc[4–0] 0x07
Figure 5-12. Trigger Definition Register (TDR)
Table 5-14. TDR Field Descriptions
Bits Name Description
31–30 TRC Trigger response control. Determines how the processor responds to a completed trigger condition. The
trigger response is always displayed on DDATA.
00 Display on DDATA only
01 Processor halt
10 Debug interrupt
11 Reserved
15:14 LxT Level-x trigger. This is a Rev. B function. The Level-x Trigger bit determines the logic operation for the
trigger between the PC_condition and the (Address_range & Data_condition) where the inclusion of a
Data condition is optional. The ColdFire debug architecture supports the creation of single or double-level
triggers.
TDR[15]
0 Level-2 trigger = PC_condition & Address_range & Data_condition
1 Level-2 trigger = PC_condition | (Address_range & Data_condition)
TDR[14]
0 Level-1 trigger = PC_condition & Address_range & Data_condition
1 Level-1 trigger = PC_condition | (Address_range & Data_condition)
29/13 EBL Enable breakpoint. Global enable for the breakpoint trigger. Setting TDR[EBL] enables a breakpoint
trigger. Clearing it disables all breakpoints.
Second-Level Trigger
First-Level Trigger
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