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Figure 8-16. Format of Handshake Packet Transmit Reservation Register (2/2)
E1NAEN
0
No data is transmitted.
1
NAK handshake is transmitted when all the following conditions are satisfied in EOP during IN packet reception.
INRX (internal signal) = 1, ADRRST = 1, END1RX = 1, TBYER = 0, TBITER = 0, CRC5ER = 0
E0NAEN
0
No data is transmitted.
1
NAK handshake is transmitted when all the following conditions are satisfied in EOP during IN packet reception.
INRX (internal signal) = 1, TIDRST = 1, ADRRST = 1, END0RX = 0, TBYER = 0, TBITER = 0, CRC5ER = 0
DNAEN
0
No data is transmitted.
1
If all the following conditions are met, NAK handshake is transmitted in EOP during data packet reception.
Set this flag when saving data from reception data addresses (USBR0 to USBR7).
OUTRX (internal signal) = 1, DIDRST = 1, DBYER = 0, DBITER = 0, CR16ER = 0, UWDERR = 0
ACKEN
0
No data is transmitted.
1
ACK handshake is transmitted when all the following conditions are satisfied in EOP during data packet reception.
DIDRST = 1, DBYER = 0, DBITER = 0, CR16ER = 0
During transmit reservation, all the conditions listed in Table 8-3 below must be satisfied.
Table 8-3. Conditions in Transmit Reservation (1/2)
(a) Transmit reservation for Endpoint 0 and IN token packet
Type of Reservation
Transmit reservation of data in transmit buffer 0
Transmit reservation of data in transmit buffer 1
Endpoint 0 STALL transmit reservation
(occurrence of length error, or halt status)
Endpoint 0 NAK transmit reservation
(data creation incomplete)
Two or more reservations above
CHAPTER 8
USB FUNCTION
NAK packet transmit reservation flag for Endpoint 1 after IN packet
NAK packet transmit reservation flag for Endpoint 0 after IN packet
NAK packet transmit reservation flag after data packet reception
ACK packet transmit reservation flag after data packet reception
Setting prohibited
User's Manual U12978EJ3V0UD
DT00EN
DT10EN
1
0
0
1
0
0
0
0
E0STEN
E0NAEN
0
0
0
0
1
0
0
1
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