UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
527 of 1269
NXP Semiconductors
UM10503
Chapter 23: LPC43xx USB0 Host/Device/OTG controller
23.6.13 USB Endpoint NAK register (ENDPTNAK)
23.6.13.1 Device mode
This register indicates when the device sends a NAK handshake on an endpoint. Each Tx
and Rx endpoint has a bit in the EPTN and EPRN field respectively.
A bit in this register is cleared by writing a 1 to it.
23.6.13.2 Host mode
This register is not used in host mode.
23.6.14 USB Endpoint NAK Enable register (ENDPTNAKEN)
23.6.14.1 Device mode
Each bit in this register enables the corresponding bit in the ENDPTNAK register. Each Tx
and Rx endpoint has a bit in the EPTNE and EPRNE field respectively.
Table 416. USB BINTERVAL register (BINTERVAL - address 0x4000 6174) bit description
Bit
Symbol
Description
Reset
value
Access
3:0
BINT
bInterval value (see
)
0x00
R/W
31:4
-
Reserved
-
-
Table 417. USB endpoint NAK register (ENDPTNAK - address 0x4000 6178) bit description
Bit
Symbol
Description
Reset
value
Access
5:0
EPRN
Rx endpoint NAK
Each RX endpoint has one bit in this field. The bit is set when the device
sends a NAK handshake on a received OUT or PING token for the
corresponding endpoint.
Bit 5 corresponds to endpoint 5.
...
Bit 1 corresponds to endpoint 1.
Bit 0 corresponds to endpoint 0.
0x00
R/WC
15:6
-
Reserved
-
-
21:16
EPTN
Tx endpoint NAK
Each TX endpoint has one bit in this field. The bit is set when the device
sends a NAK handshake on a received IN token for the corresponding
endpoint.
Bit 5 corresponds to endpoint 5.
...
Bit 1 corresponds to endpoint 1.
Bit 0 corresponds to endpoint 0.
0x00
R/WC
31:22
-
Reserved
-
-