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PM0214 数据表(PDF) 37 Page - STMicroelectronics |
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PM0214 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 245 page  DocID022708 Rev 4 37/245 PM0214 The Cortex-M4 processor 244 Bus fault A bus fault is an exception that occurs because of a memory related fault for an instruction or data memory transaction. This might be from an error detected on a bus in the memory system. Usage fault A usage fault is an exception that occurs because of a fault related to instruction execution. This includes: • An undefined instruction • An illegal unaligned access • Invalid state on instruction execution • An error on exception return. The following can cause a usage fault when the core is configured to report them: • An unaligned address on word and halfword memory access • Division by zero SVCall A supervisor call (SVC) is an exception that is triggered by the SVC instruction. In an OS environment, applications can use SVC instructions to access OS kernel functions and device drivers. PendSV PendSV is an interrupt-driven request for system-level service. In an OS environment, use PendSV for context switching when no other exception is active. SysTick A SysTick exception is an exception the system timer generates when it reaches zero. Software can also generate a SysTick exception. In an OS environment, the processor can use this exception as system tick. Interrupt (IRQ) A interrupt, or IRQ, is an exception signalled by a peripheral, or generated by a software request. All interrupts are asynchronous to instruction execution. In the system, peripherals use interrupts to communicate with the processor. Table 17. Properties of the different exception types Exception number(1) IRQ number(1) Exception type Priority Vector address or offset(2) Activation 1 - Reset -3, the highest 0x00000004 Asynchronous 2 -14 NMI -2 0x00000008 Asynchronous 3 -13 Hard fault -1 0x0000000C - 4 -12 Memory management fault Configurable(3) 0x00000010 Synchronous 5 -11 Bus fault Configurable(3) 0x00000014 Synchronous when precise Asynchronous when imprecise 6 -10 Usage fault Configurable(3) 0x00000018 Synchronous 7-10 - - - Reserved - 11 -5 SVCall Configurable(3) 0x0000002C Synchronous 12-13 - - - Reserved - 14 -2 PendSV Configurable(3) 0x00000038 Asynchronous |
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