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UM10503
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User manual
Rev. 2.1 — 10 December 2015
750 of 1441
NXP Semiconductors
UM10503
Chapter 26: LPC43xx/LPC43Sxx USB1 Host/Device controller
26.6.12 BINTERVAL register
This register defines the bInterval value which determines the length of the virtual frame
(see
Remark:
The BINTERVAL register is not related to the bInterval endpoint descriptor field
in the USB specification.
26.6.13 USB Endpoint NAK register (ENDPTNAK)
26.6.13.1 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.
26.6.13.2 Host mode
This register is not used in host mode.
Table 548. USB BINTERVAL register (BINTERVAL - address 0x4000 7174) bit description in device/host mode
Bit
Symbol
Description
Reset
value
Access
3:0
BINT
bInterval value
0x00
R/W
31:4
-
Reserved
-
-
Table 549. 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
-
-