ST STM32G4 Series Reference Manual page 215

RM0440
Bit 2 EWUP3: Enable Wakeup pin WKUP3
Bit 1 EWUP2: Enable Wakeup pin WKUP2
Bit 0 EWUP1: Enable Wakeup pin WKUP1
5.4.4 Power control register 4 (PWR_CR4)
Address offset: 0x0C
Reset value: 0x0000 0000. This register is not reset when exiting Standby modes and with
the PWRRST bit in the RCC_APB1RSTR1 register.
Access: Additional APB cycles are needed to access this register vs. a standard APB
access (3 for a write and 2 for a read).
31 30 29
Res. Res. Res. Res.
15 14 13
Res. Res. Res. Res.
Bits 31:10 Reserved, must be kept at reset value.
Bit 9 VBRS: V
Bit 8 VBE: V
Bits 7:5 Reserved, must be kept at reset value.
Bit 4 WP5: Wakeup pin WKUP5 polarity
Bit 3 WP4: Wakeup pin WKUP4 polarity
When this bit is set, the external wakeup pin WKUP3 is enabled and triggers a wakeup from
Standby or Shutdown event when a rising or a falling edge occurs. The active edge is
configured via the WP3 bit in the PWR_CR4 register.
When this bit is set, the external wakeup pin WKUP2 is enabled and triggers a wakeup from
Standby or Shutdown event when a rising or a falling edge occurs. The active edge is
configured via the WP2 bit in the PWR_CR4 register.
When this bit is set, the external wakeup pin WKUP1 is enabled and triggers a wakeup from
Standby or Shutdown event when a rising or a falling edge occurs. The active edge is
configured via the WP1 bit in the PWR_CR4 register.
28 27 26 25
Res. Res. Res.
12 11 10 9
Res. Res. VBRS
rw
battery charging resistor selection
BAT
0: Charge V through a 5 kOhms resistor
BAT
1: Charge V through a 1.5 kOhms resistor
BAT
battery charging enable
BAT
0: V battery charging disable
BAT
1: V battery charging enable
BAT
This bit defines the polarity used for an event detection on external wake-up pin, WKUP5
0: Detection on high level (rising edge)
1: Detection on low level (falling edge)
This bit defines the polarity used for an event detection on external wake-up pin, WKUP4
0: Detection on high level (rising edge)
1: Detection on low level (falling edge)
24 23 22
Res. Res. Res.
8 7 6
VBE Res. Res.
rw
RM0440 Rev 1
Power control (PWR)
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
Res. WP5 WP4 WP3
rw rw rw
17 16
Res. Res.
1 0
WP2 WP1
rw rw
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