SI1010 Datasheet, PDF (163/384 Pages) Silicon Laboratories – Ultra Low Power, 16/8 kB, 12/10-Bit ADC MCU with Integrated 240-960 MHz EZRadioPRO Transceiver

Si1010/1/2/3/4/5
SFR Definition 14.1. PMU0CF: Power Management Unit Configuration^1,2
Bit
Name
Type
Reset
7
SLEEP
W
0
6
SUSPEND
W
0
5
CLEAR
W
0
4
RSTWK
R
Varies
3
2
1
0
RTCFWK RTCAWK PMATWK CPT0WK
R/W
R/W
R/W
R/W
Varies
Varies
Varies
Varies
SFR Page = 0x0; SFR Address = 0xB5
Bit Name
Description
7
SLEEP Sleep Mode Select
6 SUSPEND Suspend Mode Select
5
CLEAR Wake-up Flag Clear
4 RSTWK Reset Pin Wake-up Flag
3 RTCFWK SmaRTClock Oscillator
Fail Wake-up Source
Enable and Flag
2 RTCAWK SmaRTClock Alarm
Wake-up Source Enable
and Flag
1 PMATWK Port Match Wake-up
Source Enable and Flag
0 CPT0WK Comparator0 Wake-up
Source Enable and Flag
Write
Writing 1 places the
device in Sleep Mode.
Writing 1 places the
device in Suspend Mode.
Writing 1 clears all wake-
up flags.
N/A
0: Disable wake-up on
SmaRTClock Osc. Fail.
1: Enable wake-up on
SmaRTClock Osc. Fail.
0: Disable wake-up on
SmaRTClock Alarm.
1: Enable wake-up on
SmaRTClock Alarm.
0: Disable wake-up on
Port Match Event.
1: Enable wake-up on 
Port Match Event.
0: Disable wake-up on
Comparator0 rising edge.
1: Enable wake-up on
Comparator0 rising edge.
Read
N/A
N/A
N/A
Set to 1 if a falling edge
has been detected on
RST.
Set to 1 if the SmaRT-
Clock Oscillator has failed.
Set to 1 if a SmaRTClock
Alarm has occurred.
Set to 1 if a Port Match
Event has occurred.
Set to 1 if Comparator0
rising edge has occurred.
Notes:
1. Read-modify-write operations (ORL, ANL, etc.) should not be used on this register. Wake-up sources must
be re-enabled each time the SLEEP or SUSPEND bits are written to 1.
2. The Low Power Internal Oscillator cannot be disabled and the MCU cannot be placed in Suspend or Sleep
Mode if any wake-up flags are set to 1. Software should clear all wake-up sources after each reset and after
each wake-up from Suspend or Sleep Modes.
3. PMU0 requires two system clocks to update the wake-up source flags after waking from Suspend mode. The
wake-up source flags will read ‘0’ during the first two system clocks following the wake from Suspend mode.
Rev. 1.0
163