ST STM32F412 User Manual

USB on-the-go full-speed (OTG_FS) RM0402
1020/1163 RM0402 Rev 6
Bits 31:22 Reserved, must be kept at reset value.
Bit 21 VBDEN: USB V
BUS
detection enable
Enables V
BUS
sensing comparators to detect V
BUS
valid levels on the V
BUS
PAD for USB
host and device operation. If HNP and/or SRP support is enabled, V
BUS
comparators are
automatically enabled independently of VBDEN value.
0 = V
BUS
detection disabled
1 = V
BUS
detection enabled
Bit 20 SDEN: Secondary detection (SD) mode enable
This bit is set by the software to put the BCD into SD mode. Only one detection mode (DCD,
PD, SD or OFF) should be selected to work correctly
Bit 19 PDEN: Primary detection (PD) mode enable
This bit is set by the software to put the BCD into PD mode. Only one detection mode (DCD,
PD, SD or OFF) should be selected to work correctly.
Bit 18 DCDEN: Data contact detection (DCD) mode enable
This bit is set by the software to put the BCD into DCD mode. Only one detection mode
(DCD, PD, SD or OFF) should be selected to work correctly.
Bit 17 BCDEN: Battery charging detector (BCD) enable
This bit is set by the software to enable the BCD support within the USB device. When
enabled, the USB PHY is fully controlled by BCD and cannot be used for normal
communication. Once the BCD discovery is finished, the BCD should be placed in OFF
mode by clearing this bit to ‘0’ in order to allow the normal USB operation.
Bit 16 PWRDWN: Power down control of FS PHY
Used to activate the FS PHY in transmission/reception. When reset, the PHY is kept in
power-down. When set, the BCD function must be off (BCDEN=0).
0 = USB FS PHY disabled
1 = USB FS PHY enabled
Bits 15:4 Reserved, must be kept at reset value.
Bit 3 PS2DET: DM pull-up detection status
This bit is active only during PD and gives the result of comparison between DM voltage
level and VLGC threshold. In normal situation, the DM level should be below this threshold.
If it is above, it means that the DM is externally pulled high. This can be caused by
connection to a PS2 port (which pulls-up both DP and DM lines) or to some proprietary
charger not following the BCD specification.
0: Normal port detected (connected to SDP, CDP or DCP)
1: PS2 port or proprietary charger detected
Bit 2 SDET: Secondary detection (SD) status
This bit gives the result of SD.
0: CDP detected
1: DCP detected
Bit 1 PDET: Primary detection (PD) status
This bit gives the result of PD.
0: no BCD support detected (connected to SDP or proprietary device).
1: BCD support detected (connected to CDP or DCP).
Bit 0 DCDET: Data contact detection (DCD) status
This bit gives the result of DCD.
0: data lines contact not detected
1: data lines contact detected

ST STM32F412 Specifications

General

Brand	ST
Model	STM32F412
Category	Microcontrollers
Language	English