PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 376

• Manufacturer Part Number: PIC18F25J50
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F46J50 FAMILY
22.5.3
The USB Error Interrupt Status register
contains the flag bits for each of the error sources
within the USB peripheral. Each of these sources is
controlled by a corresponding interrupt enable bit in
the UEIE register. All of the USB error flags are ORed
together to generate the USB Error Interrupt Flag
(UERRIF) at the top level of the interrupt logic.
REGISTER 22-9:
DS39931D-page 376
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6-5
bit 4
bit 3
bit 2
bit 1
bit 0
BTSEF
R/C-0
USB ERROR INTERRUPT STATUS
REGISTER (UEIR)
BTSEF: Bit Stuff Error Flag bit
1 = A bit stuff error has been detected
0 = No bit stuff error has been detected
Unimplemented: Read as ‘0’
BTOEF: Bus Turnaround Time-out Error Flag bit
1 = Bus turnaround time-out has occurred (more than 16 bit times of Idle from previous EOP elapsed)
0 = No bus turnaround time-out has occurred
DFN8EF: Data Field Size Error Flag bit
1 = The data field was not an integral number of bytes
0 = The data field was an integral number of bytes
CRC16EF: CRC16 Failure Flag bit
1 = The CRC16 failed
0 = The CRC16 passed
CRC5EF: CRC5 Host Error Flag bit
1 = The token packet was rejected due to a CRC5 error
0 = The token packet was accepted
PIDEF: PID Check Failure Flag bit
1 = PID check failed
0 = PID check passed
U-0
—
UEIR: USB ERROR INTERRUPT STATUS REGISTER (ACCESS F63h)
C = Clearable bit
‘1’ = Bit is set
U-0
—
(Register
BTOEF
22-9)
R/C-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
DFN8EF
R/C-0
Each error bit is set as soon as the error condition is
detected. Thus, the interrupt will typically not
correspond with the end of a token being processed.
Once an interrupt bit has been set by the SIE, it must
be cleared by software by writing a ‘0’.
CRC16EF
R/C-0
 2011 Microchip Technology Inc.
x = Bit is unknown
CRC5EF
R/C-0
PIDEF
R/C-0
bit 0