STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

USB on-the-go full-speed (OTG_FS)
RM0008
STUPCNT: SETUP packet count
Applies to control OUT Endpoints only.
This field specifies the number of back-to-back SETUP data packets the endpoint can receive.
01: 1 packet
10: 2 packets
11: 3 packets
Bit 28:19 PKTCNT: Packet count
Indicates the total number of USB packets that constitute the Transfer Size amount of data for
this endpoint.
This field is decremented every time a packet (maximum size or short packet) is written to the
RxFIFO.
Bits 18:0 XFRSIZ: Transfer size
This field contains the transfer size in bytes for the current endpoint. The core only interrupts
the application after it has exhausted the transfer size amount of data. The transfer size can be
set to the maximum packet size of the endpoint, to be interrupted at the end of each packet.
The core decrements this field every time a packet is read from the RxFIFO and written to the
external memory.
26.14.5 OTG_FS power and clock gating control register
(OTG_FS_PCGCCTL)
Address offset: 0xE00
Reset value: 0x0000 0000
This register is available in Host and Device modes.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
PHYSUSP
Reserved
GATEHCLK
STPPCLK
rw rw rw
Bit 31:5 Reserved
Bit 4 PHYSUSP: PHY Suspended
Indicates that the PHY has been suspended. This bit is updated once the PHY is suspended
after the application has set the STPPCLK bit (bit 0).
Bits 3:2 Reserved
Bit 1 GATEHCLK: Gate HCLK
The application sets this bit to gate HCLK to modules other than the AHB Slave and Master
and wakeup logic when the USB is suspended or the session is not valid. The application
clears this bit when the USB is resumed or a new session starts.
Bit 0 STPPCLK: Stop PHY clock
The application sets this bit to stop the PHY clock when the USB is suspended, the session is
not valid, or the device is disconnected. The application clears this bit when the USB is
resumed or a new session starts.
26.14.6 OTG_FS register map
776/995 Doc ID 13902 Rev 9