PC912XDP512F0MPVR datasheet(720/1348 Pages) FREESCALE

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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

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Freescale Semiconductor

is continued for another 32 lines. Upon tracing completion the breakpoint is generated, thus the breakpoint

does not occur at the tagged instruction boundary.

19.4.5.1.3

Storing with End-Trigger

Storing with end-trigger, data is stored in the trace buffer until the ﬁnal state is entered, at which point the

DBG module will become disarmed and no more data will be stored. If the trigger is at the address of a

change of ﬂow instruction the trigger event will not be stored in the trace buffer.

19.4.5.2

Trace Modes

The DBG module can operate in three trace modes. The mode is selected using the TRCMOD bits in the

DBGTCR register. In each mode tracing of XGATE or CPU information is possible. The source for the

trace is selected using the TSOURCE bits in the DBGTCR register. The modes are described in the

following subsections. The trace buffer organization is shown in Table 19-39.

19.4.5.2.1

Normal Mode

In normal mode, change of ﬂow (COF) addresses will be stored.

COF addresses are deﬁned as follows for the CPU:

•

Source address of taken conditional branches (long, short, bit-conditional, and loop primitives)

•

Destination address of indexed JMP, JSR and CALL instruction.

•

Destination address of RTI, RTS and RTC instructions

•

Vector address of interrupts, except for SWI and BDM vectors

LBRA, BRA, BSR, BGND as well as non-indexed JMP, JSR, and CALL instructions are not classiﬁed as

change of ﬂow and are not stored in the trace buffer.

COF addresses are deﬁned as follows for the XGATE:

•

Source address of taken conditional branches

•

Destination address of indexed JAL instructions.

•

First XGATE code address, determined by the vector contained in the XGATE XGVBR register

Change-of-ﬂow addresses stored include the full 23-bit address bus in the case of CPU, the 16-bit address

bus for the XGATE module and an information byte, which contains a source/destination bit to indicate

whether the stored address was a source address or destination address.

19.4.5.2.2

Loop1 Mode

Loop1 mode, similarly to normal mode also stores only COF address information to the trace buffer, it

however allows the ﬁltering out of redundant information.

The intent of loop1 mode is to prevent the trace buffer from being ﬁlled entirely with duplicate information

from a looping construct such as delays using the DBNE instruction or polling loops using

BRSET/BRCLR instructions. Immediately after address information is placed in the trace buffer, the DBG

module writes this value into a background register. This prevents consecutive duplicate address entries in

the trace buffer resulting from repeated branches.

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