Datasheet

PIC16(L)F1454/5/9
DS41639A-page 332 Preliminary  2012 Microchip Technology Inc.
REGISTER 26-7: UIR: USB INTERRUPT STATUS REGISTER
U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0 R/W-0
— SOFIF STALLIF IDLEIF
(1)
TRNIF
(2)
ACTVIF
(3)
UERRIF
(4)
URSTIF
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7
Unimplemented: Read as ‘0’
bit 6
SOFIF: Start-of-Frame Token Interrupt bit
1 = A Start-of-Frame token received by the SIE
0 = No Start-of-Frame token received by the SIE
bit 5
STALLIF: A STALL Handshake Interrupt bit
1 = A STALL handshake was sent by the SIE
0 = A STALL handshake has not been sent
bit 4
IDLEIF: Idle Detect Interrupt bit
(1)
1 = Idle condition detected (constant Idle state of 3 ms or more)
0 = No Idle condition detected
bit 3 TRNIF: Transaction Complete Interrupt bit
(2)
1 = Processing of pending transaction is complete; read USTAT register for endpoint information
0 = Processing of pending transaction is not complete or no transaction is pending
bit 2
ACTVIF: Bus Activity Detect Interrupt bit
(3)
1 = Activity on the D+/D- lines was detected
0 = No activity detected on the D+/D- lines
bit 1
UERRIF: USB Error Condition Interrupt bit
(4)
1 = An unmasked error condition has occurred
0 = No unmasked error condition has occurred
bit 0 URSTIF: USB Reset Interrupt bit
1 = Valid USB Reset occurred; UADDR register is cleared
0 = No USB Reset has occurred
Note 1: Once an Idle state is detected, the user may want to place the USB module in Suspend mode.
2: Clearing this bit will cause the USTAT FIFO to advance (valid only for IN, OUT and SETUP tokens).
3: This bit is typically unmasked only following the detection of a UIDLE interrupt event.
4: Only error conditions enabled through the UEIE register will set this bit. This bit is a status bit only and
cannot be set or cleared by the user.