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msp430F5438用户指南

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  The SYS module collects all user NMI (UNMI) sources, system NMI (SNMI) sources, and BOR/POR/PUC

  sources of all the other modules. They are combined into three interrupt vectors. The interrupt vector

  registers SYSRSTIV, SYSSNIV, SYSUNIV are used to determine which flags requested an interrupt or a

  BOR/POR/PUC reset. The interrupt with the highest priority of a group, when enabled, generates a

  number in the corresponding SYSRSTIV, SYSSNIV, SYSUNIV register. This number can be directly

  added to the program counter, causing a branch to the appropriate portion of the interrupt service routine.

  Disabled interrupts do not affect the SYSRSTIV, SYSSNIV, SYSUNIV values. A read access, read to the

  SYSRSTIV, SYSSNIV, SYSUNIV register automatically resets the highest pending interrupt flag of that

  register. If another interrupt flag is set, another interrupt is immediately generated after servicing the initial

  interrupt. A write access to the SYSRSTIV, SYSSNIV, SYSUNIV register automatically resets all pending

  interrupt flags of the group.

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