Debug Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
31-43
Figure 31-43. Example JMP Instruction Output on PST/DDATA
PST of 0x5 indicates a taken branch and the marker value 0x9 indicates a 2-byte address. Therefore, the
subsequent 4 nibbles of DDATA display the lower two bytes of address register A0 in
least-to-most-significant nibble order. The PST output after the JMP instruction completes depends on the
target instruction. The PST can continue with the next instruction before the address has completely
displayed on DDATA because of the DDATA FIFO. If the FIFO is full and the next instruction has captured
values to display on DDATA, the pipeline stalls (PST = 0x0) until space is available in the FIFO.
31.4.5
Processor Status, Debug Data Definition
This section specifies the ColdFire processor and debug module’s generation of the processor status (PST)
and debug data (DDATA) output on an instruction basis. In general, the PST/DDATA output for an
instruction is defined as follows:
PST = 0x1, {PST = [0x89B], DDATA = operand}
where the {...} definition is optional operand information defined by the setting of the CSR.
The CSR provides capabilities to display operands based on reference type (read, write, or both). A PST
value {0x8, 0x9, or 0xB} identifies the size and presence of valid data to follow on the DDATA output {1,
2, or 4 bytes}. Additionally, for certain change-of-flow branch instructions, CSR[BTB] provides the
capability to display the target instruction address on the DDATA output {2, 3, or 4 bytes} using a PST
value of {0x9, 0xA, or 0xB}.
31.4.5.1
User Instruction Set
shows the PST/DDATA specification for user-mode instructions. Rn represents any {Dn, An}
register. In this definition, the y suffix generally denotes the source, and x denotes the destination operand.
For a given instruction, the optional operand data is displayed only for those effective addresses
referencing memory. The DD nomenclature refers to the DDATA outputs.
Table 31-25. PST/DDATA Specification for User-Mode Instructions
Instruction
Operand Syntax
PST/DDATA
add.l
<ea>y,Dx
PST = 0x1, {PST = 0xB, DD = source operand}
add.l
Dy,<ea>x
PST = 0x1, {PST = 0xB, DD = source}, {PST = 0xB, DD = destination}
adda.l
<ea>y,Ax
PST = 0x1, {PST = 0xB, DD = source operand}
addi.l
#<data>,Dx
PST = 0x1
DDATA
PSTCLK
0x0
0x0
A[3:0]
0x5
0x9
default
PST
A[7:4]
A[11:8]
A[15:12]
default
default
default
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MCF52235CVM60
