手册上是这么写的。
The backup domain includes 4Kbytes of backup SRAM accessible only from the CPU, and
mode
address in 32-bit, 16-bit or 8-bit mode. Its content is retained even in Standby or V
BAT
when the low power backup regulator is enabled. It can be considered as an internal
is always present.
EEPROM when VBAT is always present.
我如何才能把变量定义到这4K SRAM