有關STM32F4的PDR_ON腳的功用

在規格書中的POWER SUPPLY SUPERVISOR章節提到.
主要是和內部重置功能的啟動有關.

當PDR_ON接到高準位(VDD)時,POR(POWER ON RESET)&PDR(POWER DOWN RESET)以及BOR(Brownout reset)以上這幾個功能才會有效.也就是internal reset on

當PDR_ON的準位低於1.7V時,就可算是internal reset off.
並且以下條件會成立
The integrated power-on reset (POR) / power-down reset (PDR) circuitry is disabled
• The brownout reset (BOR) circuitry is disabled
• The embedded programmable voltage detector (PVD) is disabled
• VBAT functionality is no more available and VBAT pin should be connected to VDD