Freescale Semiconductor MCF52230 ColdFire, Reference Manual

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Debug Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 31-47
Table 31-26 shows the PST/DDATA specification for multiply-accumulate instructions.
1
During normal exception processing, the PST output is driven to a 0xC indicating the exception processing state. The
exception stack write operands, as well as the vector read and target address of the exception handler may also be
displayed.
Exception Processing:
PST = 0xC,
{PST = 0xB,DD = destination}, // stack frame
{PST = 0xB,DD = destination}, // stack frame
{PST = 0xB,DD = source}, // vector read
PST = 0x5,{PST = [0x9AB],DD = target}// handler PC
The PST
/
DDATA specification for the reset exception is shown below:
Exception Processing:
PST = 0xC,
PST = 0x5,{PST = [0x9AB],DD = target}// handler PC
The initial references at address 0 and 4 are never captured nor displayed because these accesses are treated as
instruction fetches.
For all types of exception processing, the PST = 0xC value is driven at all times, unless the PST output is needed for one
of the optional marker values or for the taken branch indicator (0x5).
2
For JMP and JSR instructions, the optional target instruction address is displayed only for those effective address fields
defining variant addressing modes. This includes the following <ea>x values: (An), (d16,An), (d8,An,Xi), (d8,PC,Xi).
3
For move multiple instructions (MOVEM), the processor automatically generates line-sized transfers if the operand
address reaches a 0-modulo-16 boundary and there are four or more registers to be transferred. For these line-sized
transfers, the operand data is never captured nor displayed, regardless of the CSR value.
The automatic line-sized burst transfers are provided to maximize performance during these sequential memory access
operations.
4
For a predicted RTS instruction, the source operand is displayed if CSR[12], CSR[9], or CSR[8] is set.
Table 31-26. PST/DDATA Values for User-Mode Multiply-Accumulate Instructions
Instruction Operand Syntax PST/DDATA
mac.l Ry,Rx,ACCx PST = 0x1
mac.l Ry,Rx,<ea>y,Rw,ACCx PST = 0x1, {PST = 0xB, DD = source operand}
mac.w Ry,Rx,ACCx PST = 0x1
mac.w Ry,Rx,ea,Rw,ACCx PST = 0x1, {PST = 0xB, DD = source operand}
move.l {Ry,#<data>},ACCx PST = 0x1
move.l {Ry,#<data>},MACSR PST = 0x1
move.l {Ry,#<data>},MASK PST = 0x1
move.l {Ry,#<data>},ACCext01 PST = 0x1
move.l {Ry,#<data>},ACCext23 PST = 0x1
move.l ACCext01,Rx PST = 0x1
move.l ACCext23,Rx PST = 0x1
move.l ACCy,ACCx PST = 0x1
move.l ACCy,Rx PST = 0x1
move.l MACSR,CCR PST = 0x1
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