CC1110Fx / CC1111Fx
Firmware should close all pipes and wait for a
new enumeration phase when USB reset is
detected.
A USB reset will also wake up the system from
suspend. A USB resume interrupt request will
be generated, if the interrupt is configured as
described
in
13.16.3.1,
but
the
USBCIF.RSTIF interrupt flag will be set
instead of the USBCIF.RESUMIF interrupt
flag.
13.16.9 Suspend and Resume
The
USB
controller
will
assert
USBCIF.SUSPENDIF and enter suspend
mode when the USB bus has been
continuously idle for 3 ms, provided that
USBPOW.SUSPEND_EN=1. IRCON2.USBIFwill
be asserted if USBCIE.SUSPENDIE
enabled, and an interrupt request is generated
13.16.10 Remote Wakeup
The USB controller can resume from suspend
by signaling resume to the USB hub. Resume
is performed by setting USBPOW.RESUME to 1
for approximately 10 ms. According to the USB
2.0 Specification [6], the resume signaling
must be present for at least 1 ms and no more
than 15 ms. It is, however, recommended to
keep the resume signaling for approximately
10 ms. Notice that support for remote wakeup
must be declared in the USB descriptor, and
that the USB host must grant the device the
privilege to perform remote wakeup (through a
SET_FEATURE request).
is
if IEN2.USBIE=1.
While in suspend mode, only limited current
can be sourced from the USB bus. See the
USB 2.0 Specification [6] for details about this.
To be able to meet the suspend-current
requirement, the CC1111Fx should be taken
down to PM1 when suspend is detected. The
CC1111Fx should not enter PM2 or PM3 since
this will reset the USB controller.
Any valid non-idle signaling on the USB bus
will cause the USBCIF.RESUMIF to be
asserted and an interrupt request to be
generated and wake up the system if the USB
resume interrupt is configured correctly. Refer
to 13.16.3.1 for details about how to set up the
USB resume interrupt.
13.16.11 USB Registers
This section describes all USB registers used
for control and status for the USB. The USB
registers reside in XDATA memory space in
the region 0xDE00 - 0xDE3F. These registers
can be divided into three groups: The Common
USB Registers, the Indexed Endpoint
Registers, and the Endpoint FIFO Registers.
Table 34, Table 35, and Table 36 give an
overview of the registers in the three groups
respectively, while the remaining of this section
will describe each register in detail. The
Indexed Endpoint Registers represent the
currently selected endpoint. The USBINDEX
register is used to select the endpoint.
Any valid non-idle signaling on the USB bus
will cause the USBCIF.RESUMIF to be
asserted and an interrupt request to be
generated and wake up the system if the USB
resume interrupt is configured correctly. Refer
to 13.16.3.1 for details about how to set up the
USB resume interrupt.
When the system wakes up (enters active
mode) from suspend, no USB registers must
be accessed before the 48 MHZ crystal
oscillator has stabilized.
Notice that the upper register addresses
0xDE2C – 0xDE3F are reserved.
SWRS033E
Page 177 of 239
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