MC9S12XD256MAL Datasheet, PDF (751/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 20 S12X Debug (S12XDBGV3) Module
20.3.2.3 Debug Trace Control Register (DBGTCR)
Address: 0x0022
R
W
Reset
7
6
TSOURCE
0
0
5
4
TRANGE
0
0
3
2
TRCMOD
0
0
Figure 20-5. Debug Trace Control Register (DBGTCR)
1
0
TALIGN
0
0
Read: Anytime
Write: Bits 7:6 only when S12XDBG is neither secure nor armed.
Bits 5:0 anytime the module is disarmed.
Table 20-8. DBGTCR Field Descriptions
Field
Description
7–6
Trace Source Control Bits — The TSOURCE bits select the data source for the tracing session. If the MCU
TSOURCE system is secured, these bits cannot be set and tracing is inhibited. See Table 20-9.
5–4
TRANGE
Trace Range Bits — The TRANGE bits allow filtering of trace information from a selected address range when
tracing from the S12XCPU 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. If the
corresponding SRC bit is set the comparator is mapped to the XGATE buses, the TRANGE bits have no effect
on the valid address range, memory accesses within the whole memory map are traced. See Table 20-10.
3–2
TRCMOD
Trace Mode Bits — See Section 20.4.5.2 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
Trigger Align Bits — These bits control whether the trigger is aligned to the beginning, end or the middle of a
TALIGN tracing session. See Table 20-12.
Table 20-9. TSOURCE — Trace Source Bit Encoding
TSOURCE
Tracing Source
00
No tracing requested
01
10¹
11^1,2
S12XCPU
XGATE
Both S12XCPU 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.}
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
753