Rainbow Electronics AT89C51SND1C - Manual (Page 105)

105
AT8xC51SND1C
4109E–8051–06/03
Table 97. UEPRST Register
UEPRST (S:D5h) – USB Endpoint FIFO Reset Register
Reset Value = 0000 0000b
Table 98. UEPINT Register
UEPINT (S:F8h Read-only) – USB Endpoint Interrupt Register
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
- - - - - EP2RST EP1RST EP0RST
Bit
Number
Bit
Mnemonic Description
7 - 3 -
Reserved
The value read from these bits is always 0. Do not set these bits.
2 EP2RST
Endpoint 2 FIFO Reset
Set and clear to reset the endpoint 2 FIFO prior to any other operation, upon
hardware reset or when an USB bus reset has been received.
1 EP1RST
Endpoint 1 FIFO Reset
Set and clear to reset the endpoint 1 FIFO prior to any other operation, upon
hardware reset or when an USB bus reset has been received.
0 EP0RST
Endpoint 0 FIFO Reset
Set and clear to reset the endpoint 0 FIFO prior to any other operation, upon
hardware reset or when an USB bus reset has been received.
7 6 5 4 3 2 1 0
- - - - - EP2INT EP1INT EP0INT
Bit
Number
Bit
Mnemonic Description
7 - 3 -
Reserved
The value read from these bits is always 0. Do not set these bits.
2 EP2INT
Endpoint 2 Interrupt Flag
Set by hardware when an interrupt is triggered in UEPSTAX and the endpoint 2
interrupt is enabled in UEPIEN.
Must be cleared by software.
1 EP1INT
Endpoint 1 Interrupt Flag
Set by hardware when an interrupt is triggered in UEPSTAX and the endpoint 1
interrupt is enabled in UEPIEN.
Must be cleared by software.
0 EP0INT
Endpoint 0 Interrupt Flag
Set by hardware when an interrupt is triggered in UEPSTAX and the endpoint 0
interrupt is enabled in UEPIEN.
Must be cleared by software.