Datasheet

S12S Debug Module (S12SDBGV2)
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor 343
8.4.5.3.1 Information Bit Organization
The format of the bits is dependent upon the active trace mode as described below.
Field2 Bits in Detail Mode
In Detail Mode the CSZ and CRW bits indicate the type of access being made by the CPU.
Field2 Bits in Normal and Loop1 Modes
Bit 3 Bit 2 Bit 1 Bit 0
CSZ CRW ADDR[17] ADDR[16]
Figure 8-25. Field2 Bits in Detail Mode
Table 8-38. Field Descriptions
Bit Description
3
CSZ
Access Type Indicator— This bit indicates if the access was a byte or word size when tracing in Detail Mode
0 Word Access
1 Byte Access
2
CRW
Read Write Indicator — This bit indicates if the corresponding stored address corresponds to a read or write
access when tracing in Detail Mode.
0 Write Access
1 Read Access
1
ADDR[17]
Address Bus bit 17— Corresponds to system address bus bit 17.
0
ADDR[16]
Address Bus bit 16— Corresponds to system address bus bit 16.
Bit 3 Bit 2 Bit 1 Bit 0
CSD CVA PC17 PC16
Figure 8-26. Information Bits PCH
Table 8-39. PCH Field Descriptions
Bit Description
3
CSD
Source Destination Indicator — In Normal and Loop1 mode this bit indicates if the corresponding stored
address is a source or destination address. This bit has no meaning in Compressed Pure PC mode.
0 Source Address
1 Destination Address
2
CVA
Vector Indicator — In Normal and Loop1 mode this bit indicates if the corresponding stored address is a vector
address. Vector addresses are destination addresses, thus if CVA is set, then the corresponding CSD is also set.
This bit has no meaning in Compressed Pure PC mode.
0 Non-Vector Destination Address
1 Vector Destination Address
1
PC17
Program Counter bit 17— In Normal and Loop1 mode this bit corresponds to program counter bit 17.