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Chapter 20 S12X Debug (S12XDBGV3) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

779

20.4.5.3.1

Information Byte Organization

The format of the control information byte for both S12XCPU and XGATE modules is dependent upon

the active trace mode and tracing source as described below. In Normal, Loop1, or Pure PC modes tracing

of XGATE activity, XINF is used to store control information. In Normal, Loop1, or Pure PC modes

tracing of S12XCPU activity, CINF is used to store control information. In Detail Mode, CXINF contains

the control information

XGATE Information Byte

X12X_CPU Information Byte

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

XSD

XSOT

XCOT

XDV

Figure 20-24. XGATE Information Byte XINF

Table 20-40. XINF Field Descriptions

Field

Description

XSD

Source Destination Indicator — This bit indicates if the corresponding stored address is a source or destination

address. This is only used in Normal and Loop1 mode tracing.

0 Source Address

1 Destination Address or Start of Thread or Continuation of Thread

XSOT

Source Of Thread Indicator — This bit indicates that the corresponding stored address is a start of thread

address. This is only used in Normal and Loop1 mode tracing.

NOTE. This bit only has effect on devices where the XGATE module supports multiple interrupt levels.

0 Stored address not from a start of thread

1 Stored address from a start of thread

XCOT

Continuation Of Thread Indicator — This bit indicates that the corresponding stored address is the ﬁrst

address following a return from a higher priority thread. This is only used in Normal and Loop1 mode tracing.

NOTE. This bit only has effect on devices where the XGATE module supports multiple interrupt levels.

0 Stored address not from a continuation of thread

1 Stored address from a continuation of thread

XDV

Data Invalid Indicator — This bit indicates if the trace buffer entry is invalid. It is only used when tracing from

both sources in Normal, Loop1 and Pure PC modes, to indicate that the XGATE trace buffer entry is valid.

0 Trace buffer entry is invalid

1 Trace buffer entry is valid

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CSD

CVA

CDV

Figure 20-25. S12XCPU Information Byte CINF

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