Chapter 19 Debug (S12XDBGV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
Freescale Semiconductor
701
19.3.1.3
Debug Trace Control Register (DBGTCR)
Read: Anytime
Write: Bits 7:6 only when DBG is neither secure nor armed.
Bits 5:0 anytime the module is disarmed.
0x0022
7
6
5
4
3
2
1
0
R
W
TSOURCE
TRANGE
TRCMOD
TALIGN
Reset
0
0
0
0
0
0
0
0
Figure 19-5. Debug Trace Control Register (DBGTCR)
Table 19-8. DBGTCR Field Descriptions
Field
Description
7–6
TSOURCE
Trace Source Control Bits
— The TSOURCE bits select the data source for the tracing session. If the MCU
system is secured, these bits cannot be set and tracing is inhibited. See
Table 19-9
.
5–4
TRANGE[5:4]
Trace Range Bits
—The TRANGE bits allow filtering of trace information from a selected address range when
tracing from the CPU in detail mode. The XGATE tracing range cannot be narrowed using these bits. To use a
comparator for range filtering, the corresponding COMPE and SRC bits must remain cleared. If the COMPE bit
is not clear then the comparator will also be used to generate state sequence triggers or tags. If the SRC bit is
set the comparator is mapped to the XGATE busses, corrupting the trace. See
Table 19-10
.
3–2
TRCMOD[3:2]
Trace Mode Bits
— See
Section 19.4.5.2, “Trace Modes“
for detailed trace mode descriptions. In normal
mode, change of flow information is stored. In loop1 mode, change of flow information is stored but redundant
entries into trace memory are inhibited. In detail mode, address and data for all memory and register accesses
is stored. See
Table 19-11
1–0
TALIGN[1:0]
Trigger Align Bits
— These bits control whether the trigger is aligned to the beginning, end or the middle of a
tracing session. See
Table 19-12
.
Table 19-9. TSOURCE Trace Source Bit Encoding
TSOURCE
Tracing Source
00
01
10
1
11
1, 2
No tracing requested
CPU
XGATE
Both CPU and XGATE
1
No range limitations are allowed. Thus tracing operates as if TRANGE = 00.
2
No detail mode tracing supported. If TRCMOD =10, no information is stored.
Table 19-10. TRANGE Trace Range Encoding
TRANGE
Tracing Source
00
01
10
Trace from all addresses (No filter)
Trace only in address range from 0x0000 to comparator D
Trace only in address range from comparator C to 0x7FFFFF