?鶯?-MM32 ???????
?????????У???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????н????????????????Щ??????????????????????????????????????MM32L0??в????????????VDD??? 2.0V ~ 5.5V????????????????????????? 1.5V ?????
??? VDDA ?? VSSA ?????????? VDD?? VSS??
MM32L0??в??????????????????縴λ??POR??????縴λ??PDR????·???????????? 2.0V ?????????????????
?? VDD/VDDA ???????????λ??? VPOR/VPDR????????????λ??????????????λ??·??
POR = Power On Reset ??縴λ??PDR = Power Down Reset ???縴λ??
POR?????????VDD?????????????????涨????????????о???λ?????????????????С??????(??е?"??????"????е?"??λ????")????????λ?????λ??????????????䶮??VDD???????POR??????????????????????λ?????????С?????(Reset temporization)??Reset temporization?????????????????????????????????????????????POR???????????1.656V???ο?MM32 DS?????????λ??????????????????????????????и?????????????????2.0V???????????????????????????????????????????????????1.8V????2.0V???????1~2.5ms?????????????縴λ??MCU???????????????????
PDR????????VDD????????????????漲?????????о??????????λ??
MM32??????PVD??????????MCU??????VDD???м??????????????????е?PLS[12:9]λ???趨????????????????????????б??????????????????????????????????????????н????????????????Щ??????????????????????????????????????
??????????? PVD ?? VDD?????????????????PWR_CTRL???е?PLS[12:9]λ???б?????????????λ?????????????
PVD = Programmable Votage Detector ????????????????????????????????????????????????????????????????????ж????????????????????
PLS[12:9]λ???????PVD??????????????
0000??1.8V 0101??3.3V 1010??4.8V
0001??2.1V 0110??3.6V
0010??2.4V 0111??3.9V
0011??2.7V 1000??4.2V
0100??3.0V 1001??4.5V
???????/?????????PWR_CSTA???е? PVDO ??????????? VDD??????????? PVD ???????????????????????????ж??? 16?????????ж??????ж??????????????????????????ж???? VDD????? PVD ???????????? VDD ?????? PVD ????????????????ж?? 16 ???????/????????????????????? PVD ?ж?????磬??????????????????н??????????
?????????????????ж???????
1)??????????????
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);
2)??PWR_PVDLevelConfig(PWR_PVDLevel_4V2); // ?趨?????
3)??PWR_PVDCmd(ENABLE); // ???PVD
4)??EXTI_ClearITPendingBit(EXTI_Line16);//???ж?
5)??EXTI_InitStructure.EXTI_Line = EXTI_Line16; // PVD??????ж???16??
6)??EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //????ж???
7)??EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;//???????????????????趨???????????ж?
8)??EXTI_InitStructure.EXTI_LineCmd = ENABLE; // ????ж???
9)??EXTI_Init(&EXTI_InitStructure); // ?????
EXTI_InitStructure.EXTI_Trigger?????????
EXTI_Trigger_Rising---???????????????????趨?????????ж??
EXTI_Trigger_Falling---????????????????????趨?????????ж??
EXTI_Trigger_Rising_Falling---???????????????????趨???????????ж??
10)???ж??????????
NVIC_InitStructure.NVIC_IRQChannel = PVD_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
2????????????????趨????????????PVD?ж?????ж?????н?????????????
void PVD_IRQHandler(void)
{
if( RESET != EXTI_GetITStatus(EXTI_Line16))
{
EXTI_ClearITPendingBit(EXTI_Line16); ???? // ??????????????????
WriteToBackupReg(0x3210);//??BKP??????????????
}
}
???????????У????????PVD?????????ж???????????????????VDD???????PVD??????????????????????????????????γ????PVD?ж???????PWR_CSR??PVDO???λ?????????????????????????????????MCU?????????????
????????????????????????????
1)??????????????
RCC->APB1ENR |= 0x10000000;
2)???????????????????????????PVD?????
PWR->CR =0x1010; //?????????=4.2v??PVDE=1???
3)?????PVDO?????
if((PWR->CSR&0x0004) !=0)
{
SCB->AIRCR =0x05fa0004;//??????λ
}
else
{
WriteToBackupReg(0x3210);//??BKP??????????????
return;
}
С??
1?? MM32L0??в?? PVD?????????????APB1????????PVD???????????PWR????
2?? ??ü????????????ж????????????????????
?????????????/?????????PWR_CSR????PVDOλ???ж??PVDO??1??0????????????0??1??????????????????????λ???ж????????縴λ??????縴λ??
????????????鶯?MCU???????????鶯??????????-???????
????ls ?????????2022-06-08
