ST STM32L0x3 User Manual

RM0367 Rev 7 945/1043
RM0367 Universal serial bus full-speed device interface (USB)
955
Battery charging detector (USB_BCDR)
Address offset: 0x58
Reset value: 0x0000
Bits 15:8 Reserved, must be kept at reset value.
Bits 7:4 BESL[3:0]: BESL value
These bits contain the BESL value received with last ACKed LPM Token
Bit 3 REMWAKE: bRemoteWake value
This bit contains the bRemoteWake value received with last ACKed LPM Token
Bit 2 Reserved
Bit 1 LPMACK: LPM Token acknowledge enable
0: the valid LPM Token will be NYET.
1: the valid LPM Token will be ACK.
The NYET/ACK will be returned only on a successful LPM transaction:
No errors in both the EXT token and the LPM token (else ERROR)
A valid bLinkState = 0001B (L1) is received (else STALL)
Bit 0 LPMEN: LPM support enable
This bit is set by the software to enable the LPM support within the USB device. If this bit is
at ‘0 no LPM transactions are handled.
1514131211109876543210
DPPU Res. Res. Res. Res. Res. Res. Res.
PS2
DET
SDET PDET
DC
DET
SDEN PDEN
DCD
EN
BCD
EN
rw r r r r rw rw rw rw
Bit 15 DPPU: DP pull-up control
This bit is set by software to enable the embedded pull-up on the DP line. Clearing it to ‘0’
can be used to signalize disconnect to the host when needed by the user software.
Bits 14:8 Reserved, must be kept at reset value.
Bit 7 PS2DET: DM pull-up detection status
This bit is active only during PD and gives the result of comparison between DM voltage
level and V
LGC
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, ACA, CDP or DCP).
1: PS2 port or proprietary charger detected.
Bit 6 SDET: Secondary detection (SD) status
This bit gives the result of SD.
0: CDP detected.
1: DCP detected.
Bit 5 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 ACA, CDP or DCP).

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English