ARM Cortex-M3 Technical Reference Manual page 29

ARM DDI 0337G
Unrestricted Access
— Sub Region Disable (SRD), enabling efficient use of memory regions.
— You can enable a background region that implements the default memory
map attributes.
• Bus interfaces:
— Advanced High-performance Bus-Lite (AHB-Lite) ICode, DCode and
System bus interfaces.
— Private Peripheral Bus (PPB) based on Advanced Peripheral Bus (APB)
interface.
— Bit band support that includes atomic bit band write and read operations.
— Memory access alignment.
— Write buffer for buffering of write data.
— Exclusive access transfers for multiprocessor systems.
• Low-cost debug solution that features:
— Debug access to all memory and registers in the system, including access to
memory mapped devices, access to internal core registers when the core is
halted, and access to debug control registers even while SYSRESETn is
asserted.
— Serial Wire Debug Port (SW-DP) or Serial Wire JTAG Debug Port
(SWJ-DP) debug access, or both.
— Flash Patch and Breakpoint (FPB) unit for implementing breakpoints and
code patches.
— Data Watchpoint and Trace (DWT) unit for implementing watchpoints,
data tracing, and system profiling.
— Instrumentation Trace Macrocell (ITM) for support of printf style
debugging.
— Trace Port Interface Unit (TPIU) for bridging to a Trace Port Analyzer
(TPA).
— Optional Embedded Trace Macrocell (ETM) for instruction trace.
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Introduction
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