Chapter 6 S12Z Debug (S12ZDBGV2) Module
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
219
TSINF provides information about a timestamp. Bit1 indicates if the byte is a TSINF byte.
6.4.5.2.4
Pure PC Mode
In Pure PC Mode, the PC addresses of all opcodes loaded into the execution stage, including illegal
opcodes, are stored.
Tracing from a single source, compression is implemented to increase the effective trace depth. A
compressed entry consists of the lowest PC byte only. A full entry consists of all PC bytes. If the PC
remains in the same 256 byte range, then a compressed entry is made, otherwise a full entry is made. The
full entry is always the last entry of a record.
Each trace buffer line consists of 7 payload bytes, PLB0-6, containing full or compressed CPU PC
addresses and 1 information byte to indicate the type of entry (compressed or base address) for each
payload byte.
Each trace buffer line is filled from right to left. The final entry on each line is always a base address, used
as a reference for the previous entries on the same line. Whilst tracing, a base address is typically stored
Table 6-54. CINF Field Descriptions
Field
Description
7–6
CSZ
Access Type Indicator
— This field indicates the CPU access size.
00 8-bit Access
0116-bit Access
10 24-bit Access
11 32-bit Access
5
CRW
Read/Write Indicator
— Indicates if the corresponding stored address corresponds to a read or write access.
0 Write Access
1 Read Access
Table 6-55. TSINF Field Descriptions
Field
Description
3
CTI
Comparator Timestamp Indicator
— This bit indicates if the trace buffer entry corresponds to a comparator
timestamp.
0 Trace buffer entry initiated by trace mode specification conditions or timestamp counter overflow
1 Trace buffer entry initiated by comparator D match
2
PC
Program Counter Valid Indicator
— Indicates if the PC entry is valid on the timestamp line.
0 Trace buffer entry does not include PC value
1 Trace buffer entry includes PC value
0
TOVF
Timestamp Overflow Indicator
— Indicates if the trace buffer entry corresponds to a timestamp overflow
0 Trace buffer entry not initiated by a timestamp overflow
1 Trace buffer entry initiated by a timestamp overflow
