C8051F99X_10 Datasheet, PDF (166/322 Pages) Silicon Laboratories – Ultra Low Power, 8-2 kB Flash, Capacitive Sensing MCU

C8051F99x-C8051F98x
SFR Definition 15.1. PMU0CF: Power Management Unit Configuration^1,2,3
Bit
7
Name ^SLEEP
Type ^W
Reset 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
Write
Read
7
SLEEP _{Sleep Mode Select}
Writing 1 places the
N/A
device in Sleep Mode.
6 SUSPEND _{Suspend Mode Select}
Writing 1 places the
N/A
device in Suspend Mode.
5
CLEAR _{Wake-up Flag Clear}
Writing 1 clears all wake- N/A
up flags.
4 RSTWK _{Reset Pin Wake-up Flag} N/A
Set to 1 if a glitch has
been detected on RST.
3 RTCFWK _{SmaRTClock Oscillator} 0: Disable wake-up on
Set to 1 if the SmaRT-
Fail Wake-up Source
SmaRTClock Osc. Fail. Clock Oscillator has failed.
Enable and Flag
1: Enable wake-up on
SmaRTClock Osc. Fail.
2 RTCAWK _{SmaRTClock Alarm}
0: Disable wake-up on
Wake-up Source Enable ^{SmaRTClock Alarm.}
and Flag
1: Enable wake-up on
SmaRTClock Alarm.
Set to 1 if a SmaRTClock
Alarm has occurred.
1 PMATWK _{Port Match Wake-up}
0: Disable wake-up on Set to 1 if a Port Match
Source Enable and Flag ^{Port Match Event.}
Event has occurred.
1: Enable wake-up on 
Port Match Event.
0 CPT0WK _{Comparator0 Wake-up} 0: Disable wake-up on
Set to 1 if Comparator0
Source Enable and Flag ^{Comparator0 rising edge. rising edge caused the last}
1: Enable wake-up on
wake-up.
Comparator0 rising edge.
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.
166
Rev. 1.0