查看HC32的源代码

== Low Power ==

=== __WFI() ===

Wait For Interrupt, 指令执行后，MCU 挂起，直到下一个中断出现。。。

<source lang=cpp>
/* Wait For Interrupt is a hint instruction that suspends execution until one of a number of events occurs */
__attribute__((always_inline)) __STATIC_INLINE void __WFI(void)
{
  __ASM volatile ("wfi");
}
</source>

中断出现、继续执行，下一条指令位于 __WFI() 之后，即返回 wfi 指令之所在

<br>

=== Sleep Mode ===

CPU 核心不运行，其他外设都运行，aeco-goxp v1.2 约 200uA

<source lang=cpp>
void Lpm_GotoSleep(boolean_t bOnExit)
{
    SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
    SCB->SCR |= 1u<<bOnExit;
    __WFI();
}
</source>

<br>

=== DeepSleep Mode ===

少量外设运行，aeco-goxp v1.2 约 2uA

* XTL 
* RCL 
* RESET
* WDT 
* RTC 
* LPUART0-1 
* GPIO 
* VC0-1 

* CLKTRIM 
* LPTIM 
* POR/BOR 
* PCNT 
* LVD 
* LCD 

<source lang=cpp>
void Lpm_GotoDeepSleep(boolean_t bOnExit)
{
    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
    SCB->SCR |= 1u<<bOnExit;
    __WFI();
}
</source>

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