ST STM32F102 Series Reference Manual page 484

USB full speed device interface (USB)
Bit 15 CTRM: Correct Transfer Interrupt Mask
0: Correct Transfer (CTR) Interrupt disabled.
1: CTR Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 14 PMAOVRM: Packet Memory Area Over / Underrun Interrupt Mask
0: PMAOVR Interrupt disabled.
1: PMAOVR Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 13 ERRM: Error Interrupt Mask
0: ERR Interrupt disabled.
1: ERR Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 12 WKUPM: Wakeup Interrupt Mask
0: WKUP Interrupt disabled.
1: WKUP Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 11 SUSPM: Suspend mode Interrupt Mask
0: Suspend Mode Request (SUSP) Interrupt disabled.
1: SUSP Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 10 RESETM: USB Reset Interrupt Mask
0: RESET Interrupt disabled.
1: RESET Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 9 SOFM: Start Of Frame Interrupt Mask
0: SOF Interrupt disabled.
1: SOF Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bit 8 ESOFM: Expected Start Of Frame Interrupt Mask
0: Expected Start of Frame (ESOF) Interrupt disabled.
1: ESOF Interrupt enabled, an interrupt request is generated when the corresponding bit in the
USB_ISTR register is set.
Bits 7:5 Reserved.
Bit 4 RESUME: Resume request
The microcontroller can set this bit to send a Resume signal to the host. It must be activated,
according to USB specifications, for no less than 1mS and no more than 15mS after which the Host
PC is ready to drive the resume sequence up to its end.
Bit 3 FSUSP: Force suspend
Software must set this bit when the SUSP interrupt is received, which is issued when no traffic is
received by the USB peripheral for 3 mS.
0: No effect.
1: Enter suspend mode. Clocks and static power dissipation in the analog transceiver are left
unaffected. If suspend power consumption is a requirement (bus-powered device), the application
software should set the LP_MODE bit after FSUSP as explained below.
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