NXP Semiconductors LPC11U3x User Manual

UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 237 of 523
NXP Semiconductors
UM10462
Chapter 11: LPC11U3x/2x/1x USB2.0 device controller
11.7.2 Control endpoint 0
Fig 23. Flowchart of control endpoint 0 - OUT direction
Wait on EP 0Setup /Out
interrupt
EP0Setup/ Out
Interrupt = ‘1’ ?
- Clear EP0Setup /Out interrupt
- Read DevStatus (Setup ) bit
Yes
No
DevStatus(Setup ) = ‘1’ ?
Yes
- Clear EP0OUT(Active)
- Clear EP0OUT(Stall)
- Clear EP0IN(Active)
- Clear EP0IN(Stall )
- Clear EP0IN interrupt
- Clear DevStatus (Setup | IntonNak _CO | IntonNak _CI)
- Read SETUP bytes
CtrlRead ?
Yes
- Write EP0IN( Active = ‘1’
Stall = ‘1’*
NBytes)
- Write DevStatus (
IntOnNak _CO = ‘1’
IntOnNak _CI = ‘0’)
CtrlWriteNoDataStage ?
Yes
-Write EP0OUT(
Active = ‘0’
Stall = ‘1’)
- Write EP0IN( Active = ‘1’
Stall = ‘1
0 Bytes )
No
-Write EP0OUT(
Active = ‘1’
Stall = ‘1’*
NBytes)
- Write DevStatus (
IntOnNak _CO = ‘0’
IntOnNak _CI = ‘1’)
No
All OUT data received ?
- Write EP0OUT(Active = ‘1’
Stall = ‘1’*
NBytes)
No
No
Yes
- Write EP0IN( Active = ‘1’
Stall = ‘1’
0 Bytes )
- Write EP0Out (
Active = ‘0’
Stall = ‘1’)
-Clear EP0IN interrupt
SETUP request
supported ?
Yes
- Write EP0IN( Active = ‘0’
Stall = ‘1’)
-Write EP0OUT(
Active = ‘0’
Stall = ‘1’)
OUT Data phase
on-going ?
Yes
- Write EP0OUT(Active = ‘0’
Stall = ‘1’)
No
No
Note : It is very important that the
DevStatus(Setup) is only cleared after
setting EP0OUT(Active), EP0OUT(Stall),
EP0IN(Active) and EP0IN(Stall) bits are set
to zero
IN Data phase
on-going ?
EP0In Interrupt ?
No
No
Host aborts Control Write
Yes
- Write EP0OUT(Active = ‘1’
Stall = ‘1’
0 Bytes )
- Write EP0IN( Active = ‘0’
Stall = ‘1’)
- Clear EP0IN interrupt
Yes
If not all IN data transferred , the
host aborts Control Read .
Otherwise it is a normal completion
by the host
* : STALL bit must only be set when it is the last packet during the data phase for this Control Transfer

NXP Semiconductors LPC11U3x Specifications

General

Brand	NXP Semiconductors
Model	LPC11U3x
Category	Microcontrollers
Language	English