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关于低功耗模式的编程问题

在CCS环境中,有 _bic_SR_register(x)、 _bic_SR_register_on_exit(x)、_bis_SR_register(x)

、 _bis_SR_register_on_exit(x) 、 _get_SR_register()、 _get_SR_register_on_exit() 、 _nop()这些都是用来干什么的?