C2510Fx / CC2511Fx
SLEEP (0xBE) – Sleep Mode Control
Bit
Name
Reset
R/W
Description
USB Enable (CC2511Fx). This bit is unused for CC2510Fx
7
USB_EN
0
R/W
0
1
Disable (Setting this bit to 0 will reset the USB controller)
Enable
This bit will be 0 when returning from PM2 and PM3
6
XOSC_STB
HFRC_STB
RST[1:0]
0
R
R
R
High speed crystal oscillator (fXOSC) stable status
0
1
Oscillator is not powered up or not yet stable
Oscillator is powered up and stable
5
0
High speed RC oscillator (HS RCOSC) stable status
0
1
Oscillator is not powered up or not yet stable
Oscillator is powered up and stable
4:3
XX
Status bit indicating the cause of the last reset. If there are multiple resets, the
register will only contain the last event.
00
01
10
Power-on reset or Brown-out reset
External reset
Watchdog timer reset
2
OSC_PD
1
R/W
H0
High speed XOSC and HS RCOSC power down setting. The bit is cleared if
the CLKCON.OSCbit is toggled. If there is a calibration in progress and the
CPU attempts to set this bit, the bit will be updated at the end of calibration.
0
1
Both oscillators powered up
Oscillator not selected by CLKCON.OSCbit powered down
1:0
MODE[1:0]
00
R/W
Power mode setting
00
01
10
11
PM0
PM1
PM2
PM3
These bits will be set to 00 when entering PM{1-3}.
Note: It is necessary to clear the MODEbits before returning from all ISRs
associated with interrupts that can be used to wake the device from PM{1-3}.
See Section 13.1.3 for details
13.1.5
Oscillators and Clocks
crystal oscillator. This is controlled by the
CLKCON.OSC32Kbit.
The CC2510Fx/CC2511Fx has one internal
system clock. The source for the system clock
can be either a high speed RC oscillator or a
high speed crystal oscillator. The crystal
oscillator for CC2510Fx operates at 24 - 27 MHz
while the crystal oscillator for CC2511Fx
operates at 48 MHz. The 24 - 27 MHz clock is
used directly as the system clock for CC2510Fx.
On CC2511Fx, the 48 MHz clock is used by the
USB Controller only while a derived 24 MHz
clock is used as the system clock. The source
for the system clock is selected by the
CLKCON.OSCbit.
The choice of oscillator allows a trade-off
between high-accuracy in the case of the
crystal oscillator and low power consumption
when the RC oscillator is used. Note that
operation of the RF transceiver requires that
the high speed crystal oscillator is used.
Note: The high speed crystal oscillator
must be stable (SLEEP.XOSC_STB=1)
before using the radio.
There is also one 32 kHz clock source that can
either be a low power RCOSC or a 32.768 kHz
SWRS055D
Page 77 of 243
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