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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM0214 датащи(PDF) 219 Page - STMicroelectronics |
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PM0214 датащи(HTML) 219 Page - STMicroelectronics |
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219 / 245 page  DocID022708 Rev 4 219/245 PM0214 Core peripherals 244 4.4.9 System handler control and state register (SHCSR) Address offset: 0x24 Reset value: 0x0000 0000 Required privilege: Privileged The SHCSR enables the system handlers, and indicates: • The pending status of the bus fault, memory management fault, and SVC exceptions • The active status of the system handlers. If you disable a system handler and the corresponding fault occurs, the processor treats the fault as a hard fault. You can write to this register to change the pending or active status of system exceptions. An OS kernel can write to the active bits to perform a context switch that changes the current exception type. • Software that changes the value of an active bit in this register without correct adjustment to the stacked content can cause the processor to generate a fault exception. Ensure software that writes to this register retains and subsequently restores the current active status. • After you have enabled the system handlers, if you have to change the value of a bit in this register you must use a read-modify-write procedure to ensure that you change only the required bit. 31 3029 28 27 26 25 24 23 22 21 20 19 18 17 16 Reserved USG FAULT ENA BUS FAULT ENA MEM FAULT ENA rw rw rw 15 14 13 12 11 10 9 8 76 54 3 21 0 SV CALL PEND ED BUS FAULT PEND ED MEM FAULT PEND ED USG FAULT PEND ED SYS TICK ACT PEND SV ACT Res. MONIT OR ACT SV CALL ACT Reserved USG FAULT ACT Res. BUS FAULT ACT MEM FAULT ACT rw rw rw rw rw rw rw rw rw rw rw Bits 31:19 Reserved, must be kept cleared Bit 18 USGFAULTENA: Usage fault enable bit, set to 1 to enable(1) Bit 17 BUSFAULTENA: Bus fault enable bit, set to 1 to enable(1) Bit 16 MEMFAULTENA: Memory management fault enable bit, set to 1 to enable(1) Bit 15 SVCALLPENDED: SVC call pending bit, reads as 1 if exception is pending(2) Bit 14 BUSFAULTPENDED: Bus fault exception pending bit, reads as 1 if exception is pending(2) Bit 13 MEMFAULTPENDED: Memory management fault exception pending bit, reads as 1 if exception is pending(2) Bit 12 USGFAULTPENDED: Usage fault exception pending bit, reads as 1 if exception is pending(2) Bit 11 SYSTICKACT: SysTick exception active bit, reads as 1 if exception is active(3) Bit 10 PENDSVACT: PendSV exception active bit, reads as 1 if exception is active Bit 9 Reserved, must be kept cleared |
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