Microchip Technology DM240015 Data Sheet

DS30009312B-page 296

 2012-2013 Microchip Technology Inc.

 

U-0

U-0

U-0

U-0

U-0

U-0

U-0

U-0

—

—

—

—

—

—

—

—

bit 15

bit 8

R/K-0, HS

U-0

R/K-0, HS

R/K-0, HS

R/K-0, HS

R/K-0, HS

R/K-0, HS

R/K-0, HS

BTSEF

—

DMAEF

BTOEF

DFN8EF

CRC16EF

CRC5EF

PIDEF

EOFEF

bit 7

bit 0

U = Unimplemented bit, read as ‘0’

R = Readable bit

K = Write ‘1’ to Clear bit

HS = Hardware Settable bit

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-8

 Read as ‘0’

bit 7

 Bit Stuff Error Flag bit

1

 = Bit stuff error has been detected

0

 = No bit stuff error has been detected

bit 6

 Read as ‘0’

bit 5

 DMA Error Flag bit

1

 = A USB DMA error condition is detected; the data size indicated by the BD byte count field is less

than the number of received bytes, the received data is truncated

0

 = No DMA error

bit 4

 Bus Turnaround Time-out Error Flag bit 

1

 = Bus turnaround time-out has occurred

0

 = No bus turnaround time-out has occurred

bit 3

 Data Field Size Error Flag bit

1

 = Data field was not an integral number of bytes

0

 = Data field was an integral number of bytes

bit 2

 CRC16 Failure Flag bit

1

 = CRC16 failed

0

 = CRC16 passed

bit 1

For Device mode:
CRC5EF:

 CRC5 Host Error Flag bit

1

 = Token packet is rejected due to CRC5 error

0

 = Token packet is accepted (no CRC5 error)

For Host mode:
EOFEF:

 End-of-Frame (EOF) Error Flag bit

1

 = End-of-Frame error has occurred

0

 = End-of-Frame interrupt is disabled

bit 0

 PID Check Failure Flag bit

1

 = PID check failed

0

 = PID check passed

Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits, at the moment of the write, to become cleared.