Справочник Пользователя для Silicon Laboratories C8051F342
C8051F340/1/2/3/4/5/6/7
180
Rev. 0.5
USB Register Definition 16.16. CMIE: USB0 Common Interrupt Enable
16.9. The Serial Interface Engine
The Serial Interface Engine (SIE) performs all low level USB protocol tasks, interrupting the processor
when data has successfully been transmitted or received. When receiving data, the SIE will interrupt the
processor when a complete data packet has been received; appropriate handshaking signals are automat-
ically generated by the SIE. When transmitting data, the SIE will interrupt the processor when a complete
data packet has been transmitted and the appropriate handshake signal has been received.
when data has successfully been transmitted or received. When receiving data, the SIE will interrupt the
processor when a complete data packet has been received; appropriate handshaking signals are automat-
ically generated by the SIE. When transmitting data, the SIE will interrupt the processor when a complete
data packet has been transmitted and the appropriate handshake signal has been received.
The SIE will not interrupt the processor when corrupted/erroneous packets are received.
16.10. Endpoint0
Endpoint0 is managed through the USB register E0CSR (USB Register Definition 16.17). The INDEX reg-
ister must be loaded with 0x00 to access the E0CSR register.
ister must be loaded with 0x00 to access the E0CSR register.
An Endpoint0 interrupt is generated when:
1.
A data packet (OUT or SETUP) has been received and loaded into the Endpoint0 FIFO. The
OPRDY bit (E0CSR.0) is set to ‘1’ by hardware.
OPRDY bit (E0CSR.0) is set to ‘1’ by hardware.
2.
An IN data packet has successfully been unloaded from the Endpoint0 FIFO and transmitted
to the host; INPRDY is reset to ‘0’ by hardware.
to the host; INPRDY is reset to ‘0’ by hardware.
3.
An IN transaction is completed (this interrupt generated during the status stage of the transac-
tion).
tion).
4.
Hardware sets the STSTL bit (E0CSR.2) after a control transaction ended due to a protocol
violation.
violation.
5.
Hardware sets the SUEND bit (E0CSR.4) because a control transfer ended before firmware
sets the DATAEND bit (E0CSR.3).
sets the DATAEND bit (E0CSR.3).
Bits7–4: Unused. Read = 0000b; Write = don’t care.
Bit3:
Bit3:
SOFE: Start of Frame Interrupt Enable
0: SOF interrupt disabled.
1: SOF interrupt enabled.
0: SOF interrupt disabled.
1: SOF interrupt enabled.
Bit2:
RSTINTE: Reset Interrupt Enable
0: Reset interrupt disabled.
1: Reset interrupt enabled.
0: Reset interrupt disabled.
1: Reset interrupt enabled.
Bit1:
RSUINTE: Resume Interrupt Enable
0: Resume interrupt disabled.
1: Resume interrupt enabled.
0: Resume interrupt disabled.
1: Resume interrupt enabled.
Bit0:
SUSINTE: Suspend Interrupt Enable
0: Suspend interrupt disabled.
1: Suspend interrupt enabled.
0: Suspend interrupt disabled.
1: Suspend interrupt enabled.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
-
-
-
-
SOFE
RSTINTE RSUINTE SUSINTE 00000110
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
USB Address:
0x0B