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71M6543F/71M6543G Data Sheet
Name
Location Rst Wk Dir
Description
This word describes the source of power and the status of the VDD.
VSTAT[2:0]
Description
000
System Power OK. V3P3A>3.0v. Analog modules are functional and
accurate. [V3AOK,V3OK]=11
001
System Power Low. 2.8v<V3P3A<3.0v. Analog modules not accurate.
Switch over to battery power is imminent. [V3AOK,V3OK]=01
VSTAT[2:0]
SFR F9[2:0]
–
–
R
010
Battery power and VDD OK. VDD>2.25v. Full digital functionality.
[V3AOK,V3OK]=00, [VDDOK,VDDgt2]=11
011
101
Battery power and VDD>2.0. Flash writes are inhibited. If the
TRIMVDD[5] fuse is blown, PLL_FAST is cleared.
[V3AOK,V3OK]=00, [VDDOK,VDDgt2]=01
Battery power and VDD<2.0. When VSTAT=101, processor is nearly
out of voltage. Processor failure is imminent.
[V3AOK,V3OK]=00, [VDDOK,VDDgt2]=00
WAKE_ARM
WAKE_TMR
WD_RST
WF_DIO4
WF_DIO52
WF_DIO55
WF_TMR
WF_PB
WF_RX
WF_CSTART
WF_RST
WF_RSTBIT
WF_OVF
WF_ERST
WF_BADVDD
28B2[5]
2880[7:0]
28B4[7]
28B1[2]
28B1[1]
28B1[0]
28B1[5]
28B1[3]
28B1[4]
28B0[7]
28B0[6]
28B0[5]
28B0[4]
28B0[3]
28B0[2]
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
–
–
0
–
–
–
–
–
–
–
R/W
R/W
W
R
R
R
R
R
R
R
Arms the WAKE timer and loads it with WAKE_TMR[7:0]. When SLEEP or LCD mode
is asserted by the MPU, the WAKE timer becomes active.
Timer duration is WAKE_TMR+1 seconds.
Reset the WD timer. The WD is reset when a 1 is written to this bit. Writing a one
clears and restarts the watch dog timer.
DIO4 wake flag bit. If DIO4 is configured to wake the part, this bit is set whenever the
de-bounced version of DIO4 rises. It is held in reset if DI04 is not configured for
wakeup.
DIO52 wake flag bit. If DIO52 is configured to wake the part, this bit is set whenever the
de-bounced version of DIO52 rises. It is held in reset if DI052 is not configured for wakeup.
DIO55 wake flag bit. If DIO55 is configured to wake the part, this bit is set whenever the
de-bounced version of DIO55 rises. It is held in reset if DI055 is not configured for wakeup.
Indicates that the wake timer caused the part to wake up.
Indicates that the PB caused the part to wake.
Indicates that RX caused the part to wake.
Indicates that the Reset pin, Reset bit, ERST pin, Watchdog timer, the cold start detector,
or bad VBAT caused the part to reset.
v2
115
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