Freescale Semiconductor MCF52277 Reference Manual page 787

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},
{PST = 0xB,DD = destination},
{PST = 0xB,DD = source},
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.
Table 32-26 shows the PST/DDATA specification for multiply-accumulate instructions.
Table 32-26. PST/DDATA Values for User-Mode Multiply-Accumulate Instructions
Instruction
mac.l
mac.l
mac.w
mac.w
move.l
move.l
move.l
move.l
move.l
move.l
move.l
move.l
move.l
move.l
Freescale Semiconductor
Operand Syntax
Ry,Rx,ACCx
Ry,Rx,<ea>y,Rw,ACCx
Ry,Rx,ACCx
Ry,Rx,ea,Rw,ACCx
{Ry,#<data>},ACCx
{Ry,#<data>},MACSR
{Ry,#<data>},MASK
{Ry,#<data>},ACCext01
{Ry,#<data>},ACCext23
ACCext01,Rx
ACCext23,Rx
ACCy,ACCx
ACCy,Rx
MACSR,CCR
MCF52277 Reference Manual, Rev. 1
// stack frame
// stack frame
// vector read
PST/DDATA
PST = 0x1
PST = 0x1, {PST = 0xB, DD = source operand}
PST = 0x1
PST = 0x1, {PST = 0xB, DD = source operand}
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
PST = 0x1
Debug Module
32-47