NRF52820-QDAA-R datasheet(385/437 Pages) NORDIC

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Peripherals

6.26.12 USB register access limitations

Some of the registers in USBD cannot be accessed in specific conditions.

This may be the case when USBD is not enabled (using the ENABLE register) and ready (signalled by the

READY bit in EVENTCAUSE after a USBEVENT event), or when USBD is in low power mode while the USB

bus is suspended.

Triggering any tasks, including the tasks triggered through the PPI, is affected by this behavior. In addition,

the following registers are affected:

• HALTED.EPIN[0..7]

• HALTED.EPOUT[0..7]

• USBADDR

• BMREQUESTTYPE

• BREQUEST

• WVALUEL

• WVALUEH

• WINDEXL

• WINDEXH

• WLENGTHL

• WLENGTHH

• SIZE.EPOUT[0..7]

• SIZE.ISOOUT

• USBPULLUP

• DTOGGLE

• EPINEN

• EPOUTEN

• EPSTALL

• ISOSPLIT

• FRAMECNTR

6.26.13 Registers

Base address

Peripheral

Instance

Description

Configuration

0x40027000

USBD

Universal serial bus device

Table 111: Instances

Offset

Description

TASKS_STARTEPIN[0]

0x004

Captures the EPIN[0].PTR and EPIN[0].MAXCNT registers values, and enables endpoint IN 0 to

respond to traffic from host

TASKS_STARTEPIN[1]

0x008

Captures the EPIN[1].PTR and EPIN[1].MAXCNT registers values, and enables endpoint IN 1 to

respond to traffic from host

TASKS_STARTEPIN[2]

0x00C

Captures the EPIN[2].PTR and EPIN[2].MAXCNT registers values, and enables endpoint IN 2 to

respond to traffic from host

TASKS_STARTEPIN[3]

0x010

Captures the EPIN[3].PTR and EPIN[3].MAXCNT registers values, and enables endpoint IN 3 to

respond to traffic from host

TASKS_STARTEPIN[4]

0x014

Captures the EPIN[4].PTR and EPIN[4].MAXCNT registers values, and enables endpoint IN 4 to

respond to traffic from host

TASKS_STARTEPIN[5]

0x018

Captures the EPIN[5].PTR and EPIN[5].MAXCNT registers values, and enables endpoint IN 5 to

respond to traffic from host

4463_156 v1.0

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