mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 159

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
Note that the debug module requires the use of the internal bus to perform BDM
commands. In Revision A, if the processor is executing a tight loop that is contained within
a single aligned longword, the processor may never grant the internal bus to the debug
module, for example:
label1: nop
or
label2: bra.w label2
The processor grants the internal bus if these loops are forced across two longwords.
5.7 Processor Status, DDATA 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:
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}.
5.7.1 User Instruction Set
Table 5-22 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.
Instruction
addq.l
addx.l
addi.l
add.l
add.l
and.l
align4
bra.b label1
align4
Table 5-22. PST/DDATA Specification for User-Mode Instructions
Operand Syntax
#imm,<ea>x
<ea>y,Rx
Dy,<ea>x
<ea>y,Dx
#imm,Dx
Dy,Dx
PST = 0x1, {PST = [0x89B], DDATA= operand}
PST = 0x1, {PST = 0xB, DD = source operand}
PST = 0x1, {PST = 0xB, DD = source}, {PST = 0xB, DD = destination}
PST = 0x1
PST = 0x1, {PST = 0xB, DD = source}, {PST = 0xB, DD = destination}
PST = 0x1
PST = 0x1, {PST = 0xB, DD = source operand}
Chapter 5. Debug Support
PST/DDATA
Processor Status, DDATA Definition
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