Format Of Usb Timer Start Reservation Control Register - NEC switch User Manual

(8) USB timer start reservation control register (USBTCL)
This register reserves USB timer start after reception of a SETUP/OUT packet or transmission of a data packet.
USBTCL is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets USBTCL to 01H.
Note
SETUP reception also sets USBTCL to 01H.
Note SETUP reception implies the satisfaction of all the following three conditions.
• Matching of address
• Endpoint 0 received
• No error in reception
Figure 8-18. Format of USB Timer Start Reservation Control Register
Symbol 7 6
USBTCL 0 0
DATATX
0 Do not start USB timer.
1
USB timer starts when all the following conditions are satisfied in EOP during data packet transmission.
DIDRST = 1, DBYER = 0, DBITER = 0, CR16ER = 0
SETORX
0 Do not start USB timer.
1 USB timer starts when all the following conditions are satisfied in EOP during SETUP/OUT token packet reception.
OUTRX (internal signal) = 1 or SETRX = 1, ADRRST = 1, END0RX = 1, TBYER = 0, TBITER = 0, CRC5ER = 0
120
CHAPTER 8 USB FUNCTION
5 4 3
0 0 0
USB timer start reservation after data packet transmission
USB timer start reservation after SETUP/OUT token packet reception
User's Manual U12978EJ3V0UD
2 1 0 Address
0 DATATX SETORX FF6CH
After reset R/W
01H R/W