NXP Semiconductors
UM10858
PN7462 family HW user manual
UM10858
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2018. All rights reserved.
User manual
COMPANY PUBLIC
Rev. 1.4 — 14 May 2018
314514
325 of 345
Bit
Symbol
Value Description
Reset
Value
Access
16
DCON
Device status – connect. The connect bit must be set by SW to
indicate that the device must signal connect. The pull-up resistor on
D+ will be enabled when this bit is set and the VbusDebounced bit
is one.
0
R/W
17
DSUS
Device status – suspend. The suspend bit indicates the current
suspend state. It is set to 1 when the device hasn´t seen any activity
on its upstream port for more than 3 milliseconds. It is reset to 0 on
any activity. When the device is suspended (Suspend bit = 1) and
the firmware writes a 0 to it, the device will generate a remote
wakeup. This will only happen when the device is connected
(Connect bit = 1). When the device is not connected or not
suspended, a writing a 0 has no effect. Writing a 1 has never an
effect.
0
R/W
18
RESERVED
Reserved
0
RO
19
LPM_SUS
Device status – LPM Suspend. This bit represents the current LPM
suspend state. It is set to 1 by hardware when the device has
acknowledged the LPM request from the USB host and the Token
Retry Time of 10 µs has elapsed. When the device is in the LPM
suspended state (LPM suspend bit = 1) and the firmware writes a
zero to this bit, the device will generate a remote wakeup. Firmware
can only write a zero to this bit when the LPM_REWP bit is set to 1.
Hardware resets this bit when it receives a host initiated resume.
Hardware only updates the LPM_SUS bit when the LPM_SUPP bit
is equal to one.
0
R/W
20
LPM_REWP
LPM Remote Wakeup Enabled by USB host. Hardware sets this bit
to one when the bRemoteWake bit in the LPM extended token is set
to 1. Hardware will reset this bit to 0 when it receives the host
initiated LPM resume, when a remote wakeup is sent by the device
or when a USB bus reset is received. Firmware can use this bit to
check if the remote wake up feature is enabled by the host for the
LPM transaction.
0
R/W
23:21 RESERVED
Reserved
0
RO
24
DCON_C
Device status – connect change. The connect change bit is set
when the devices pull-up resistor is disconnected because VBus
disappeared. The bit is reset by firmware writing a one to it.
0
R/W/C
25
DSUS_C
Device status – suspend change. The suspend change bit is set to
1 when the suspend bit toggles. The suspend bit can toggle
because:
- The device goes in the suspended state
- The device is disconnected
- The device receives resume signaling on its upstream port
The bit is reset by firmware writing a one to it.
0
R/W/C
26
DRES_C
Device status – reset change. This bit is set when the device
received a bus reset. On a bus reset the device will automatically go
to the default state (unconfigured and responding to address 0). The
bit is reset by firmware writing a one to it.
0
R/W/C
27
RESERVED
Reserved
0
RO
