39.8.2.1. Control B
Name:
CTRLB
Offset:
0x08
Reset:
0x0001
Property:
PAC Write-Protection
Bit
15
14
13
12
11
10
9
8
LPMHDSK[1:0]
GNAK
Access
R/W
R/W
R/W
Reset
0
0
0
Bit
7
6
5
4
3
2
1
0
NREPLY
SPDCONF[1:0]
UPRSM
DETACH
Access
R
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
Bits 11:10 – LPMHDSK[1:0]: Link Power Management Handshake
These bits select the Link Power Management Handshake configuration.
Value
Description
0x0
No handshake. LPM is not supported.
0x1
ACK
0x2
NYET
0x3
Reserved
Bit 9 – GNAK: Global NAK
This bit configures the operating mode of the NAK.
This bit is not synchronized.
Value
Description
0
The handshake packet reports the status of the USB transaction
1
A NAK handshake is answered for each USB transaction regardless of the current endpoint
memory bank status
Bit 4 – NREPLY: No reply excepted SETUP Token
This bit is cleared by hardware when receiving a SETUP packet.
This bit has no effect for any other endpoint but endpoint 0.
Value
Description
0
Disable the “NO_REPLY” feature: Any transaction to endpoint 0 will be handled according to
the USB2.0 standard.
1
Enable the “NO_REPLY” feature: Any transaction to endpoint 0 will be ignored except
SETUP.
Atmel SAM L22G / L22J / L22N [DATASHEET]
Atmel-42402E-SAM L22G / L22J / L22N_Datasheet_Complete-07/2016
939