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BORIFG Brown out reset flag. This bit is set after VCC power up and can be cleared by software.
RSTIFG External reset interrupt flag. Set on a reset condition at RST/NMI pin in reset mode. Reset on VCC power up
请您看一下用户指南内的说明
At power-up, the RST/NMI pin is configured in the reset mode. The function of the RST/NMI pin is selected in the watchdog control register WDTCTL. If the RST/NMI pin is set to the reset function, the CPU is held in the reset state as long as the RST/NMI pin is held low. After the input changes to a high
state, the CPU starts program execution at the word address stored in the reset vector, 0FFFEh, and the RSTIFG flag is set.