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Chapter 20 Debug (S12XDBGV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 799
20.3.1.3 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
76543210
R
TSOURCE TRANGE TRCMOD TALIGN
W
Reset 00000000
Figure 20-5. Debug Trace Control Register (DBGTCR)
Table 20-8. 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 20-9.
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 20-10.
3–2
TRCMOD[3:2]
Trace Mode Bits — See Section 20.4.5.2, “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 20-11
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 20-12.
Table 20-9. TSOURCE Trace Source Bit Encoding
TSOURCE Tracing Source
00 No tracing requested
01 CPU
10
1
1
No range limitations are allowed. Thus tracing operates as if TRANGE = 00.
XGATE
11
1, 2
2
No detail mode tracing supported. If TRCMOD =10, no information is stored.
Both CPU and XGATE
Table 20-10. TRANGE Trace Range Encoding
TRANGE Tracing Source
00 Trace from all addresses (No filter)
01 Trace only in address range from 0x0000 to comparator D
10 Trace only in address range from comparator C to 0x7FFFFF