DocID15687 Rev 5 5/29
PM0059 Glossary
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1 Glossary
This section gives a brief definition of acronyms and abbreviations used in this document:
• The CPU core integrates two debug ports:
– JTAG debug port (JTAG-DP) provides a 5-pin standard interface based on the
Joint Test Action Group (JTAG) protocol.
– SWD debug port (SWD-DP) provides a 2-pin (clock and data) interface based on
the Serial Wire Debug (SWD) protocol.
For both the JTAG and SWD protocols, please refer to the Cortex M3 Technical
Reference Manual
• Word: data/instruction of 32-bit length.
• Half word: data/instruction of 16-bit length.
• Byte: data of 8-bit length.
• Double word: data of 64-bit length.
• IAP (in-application programming): IAP is the ability to reprogram the Flash memory of a
microcontroller while the user program is running.
• ICP (in-circuit programming): ICP is the ability to program the Flash memory of a
microcontroller using the JTAG protocol, the SWD protocol or the bootloader while the
device is mounted on the user application board.
• I-Code: this bus connects the Instruction bus of the CPU core to the Flash instruction
interface. Prefetch is performed on this bus.
• D-Code: this bus connects the D-Code bus (literal load and debug access) of the CPU
to the Flash data interface.
• Option bytes: product configuration bits stored in the Flash memory.
• OBL: option byte loader.
• AHB: advanced high-performance bus.
• CPU: refers to the Cortex-M3 core.
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