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HCS12 bảng dữ liệu(PDF) 86 Page - Freescale Semiconductor, Inc

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Giải thích chi tiết về linh kiện  HCS12 Microcontrollers
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S12CPUV2 Reference Manual, Rev. 4.0
86
Freescale Semiconductor
5.28 Background Mode and Null Operations
Background debug mode (BDM) is a special CPU12 operating mode that is
used for system development and debugging. Executing enter background
debug mode (BGND) when BDM is enabled puts the CPU12 in this mode.
For complete information, refer to Section 8. Instruction Queue.
Null operations are often used to replace other instructions during software
debugging. Replacing conditional branch instructions with branch never
(BRN), for instance, permits testing a decision-making routine by disabling
the conditional branch without disturbing the offset value.
Null operations can also be used in software delay programs to consume
execution time without disturbing the contents of other CPU registers or
memory.
Table 5-28 shows the BGND and null operation (NOP) instructions.
Table 5-28. Background Mode and Null Operation Instructions
Mnemonic
Function
Operation
BGND
Enter background debug mode
If BDM enabled, enter BDM;
else resume normal processing
BRN
Branch never
Does not branch
LBRN
Long branch never
Does not branch
NOP
Null operation
—



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