Data Sheet

819
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
31.8.5.8 Host Interrupt Flag Register
Name:
INTFLAG
Offset: 0x1C
Reset: 0x0000
Property: -
z Bits 15:10 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z Bit 9 – DDISC: Device Disconnection Interrupt Flag
This flag is cleared by writing a one to the flag.
This flag is set when the device has been removed from the USB Bus and will generate an interrupt if INTEN-
CLR/SET.DDISC is one.
Writing a zero to this bit has no effect.
Writing a one to this bit clears the DDISC Interrupt Flag.
z Bit 8 – DCONN: Device Connection Interrupt Flag
This flag is cleared by writing a one to the flag.
This flag is set when a new device has been connected to the USB BUS and will generate an interrupt if INTEN-
CLR/SET.DCONN is one.
Writing a zero to this bit has no effect.
Writing a one to this bit clears the DCONN Interrupt Flag.
z Bit 7 – RAMACER: RAM Access Interrupt Flag
This flag is cleared by writing a one to the flag.
This flag is set when a RAM access error occurs during an OUT stage and will generate an interrupt if INTEN-
CLR/SET.RAMACER is one.
Writing a zero to this bit has no effect.
z Bit 6 – UPRSM: Upstream Resume from the Device Interrupt Flag
This flag is cleared by writing a one to the flag.
This flag is set when the USB has received an Upstream Resume signal from the Device and will generate an
interrupt if INTENCLR/SET.UPRSM is one.
Writing a zero to this bit has no effect.
Bit151413121110 9 8
DDISC DCONN
AccessRRRRRRR/WR/W
Reset00000000
Bit76543210
RAMACER UPRSM DNRSM WAKEUP RST HSOF
Access R/W R/W R/W R/W R/W R/W R/W R/W
Reset00000000