UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
610 of 1269
NXP Semiconductors
UM10503
Chapter 24: LPC43xx USB1 Host/Device controller
24.6.13.2 Host mode
This register is not used in host mode.
24.6.14 USB Endpoint NAK Enable register (ENDPTNAKEN)
24.6.14.1 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 479. USB endpoint NAK register in device mode (ENDPTNAK - address 0x4000 7178) bit description
Bit
Symbol
Description
Reset
value
Access
3:0
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 3 corresponds to endpoint 3.
...
Bit 1 corresponds to endpoint 1.
Bit 0 corresponds to endpoint 0.
0x00
R/WC
15:6
-
Reserved
-
-
19:16
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 3 corresponds to endpoint 3.
...
Bit 1 corresponds to endpoint 1.
Bit 0 corresponds to endpoint 0.
0x00
R/WC
31:20
-
Reserved
-
-