SN8F2280 Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
1 = Enable regulator output 3.3volts.
Bit 6
Bit 5
DP_UP_EN: D+ internal 1.5k ohm pull up resistor control bit.
0 = Disable D+ pull up 1.5k ohm to 3.3volts.
1 = Enable D+ pull up 1.5k ohm to 3.3volts.
SOF_INT_EN: USB SIE’s SOF packet receive interrupt enable.
0 = Disable USB SIE’s SOF interrupt request.
1 = Enable USB SIE’s SOF interrupt request.
Bit [3:0] EPnNAK_INT_EN [3:0]: EP1~EP4 NAK transaction interrupts enable control bits. n = 1, 2, 3, 4.
0 = Disable NAK transaction interrupt request.
1 = Enable NAK transaction interrupt request.
9.5.5 USB endpoint’s ACK handshaking flag REGISTER
The status of endpoint’s ACK transaction.
095H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
EP4_ACK EP3_ACK EP2_ACK EP1_ACK
EP_ACK
Read/Write
After reset
R/W
0
R/W
0
R/W
0
R/W
0
Bit [3:0] EPn_ACK [3:0]: EP1~EP4 ACK transaction. n= 1, 2, 3, 4. The bit is set whenever the endpoint that
completes with an ACK received.
0 = the endpoint (interrupt pipe) doesn’t complete with an ACK.
1 = the endpoint (interrupt pipe) complete with an ACK.
9.5.6 USB endpoint’s NAK handshaking flag REGISTER
The status of endpoint’s NAK transaction.
096H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
EP4_NAK EP3_NAK EP2_NAK EP1_NAK
EP_NAK
Read/Write
After reset
R/W
0
R/W
0
R/W
0
R/W
0
Bit [3:0] EPn_NAK [3:0]: EP1~EP4 NAK transaction. n = 1, 2, 3, 4. The bit is set whenever the endpoint that
completes with an NAK received.
0 = the EPnNAK_INT_EN = 0 or the endpoint (interrupt pipe) doesn’t complete with an NAK.
1 = the EPnNAK_INT_EN = 1 and the endpoint (interrupt pipe) complete with an NAK.
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