Rainbow Electronics 71M6542G User Manual
Page 124
124
© 2008–2011 Teridian Semiconductor Corporation
v1.1
Name
Location
Rst Wk Dir Description
VSTAT[2:0]
SFR F9[2:0]
– –
R
This word describes the source of power and the status of the VDD.
VSTAT 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
010
Battery power and VDD OK. VDD>2.25v. Full digital functionality.
[V3AOK,V3OK] = 00, [VDDOK,VDDgt2] = 11
011
Battery power and VDD>2.0. Flash writes are inhibited. If the
TRIMVDD[5] fuse is blown, PLL_FAST (I/O RAM 0x2200[4]) is
cleared.
[V3AOK,V3OK] = 00, [VDDOK,VDDgt2] = 01
101
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
28B2[5]
0 – R/W
Arms the WAKE timer and loads it with WAKE_TMR[7:0]. When SLEEP or
LCD_ONLY is asserted by the MPU, the WAKE timer becomes active.
WAKE_TMR[7:0]
2880[7:0]
0 – R/W Timer duration is WAKE_TMR+1 seconds.
WD_RST
28B4[7]
0 0
W
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.
WF_DIO4
28B1[2]
0 –
R
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.
WF_DIO52
28B1[1]
0 –
R
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.
WF_DIO55
28B1[0]
0 –
R
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.
WF_TMR
28B1[5]
0 –
R
Indicates that the wake timer caused the part to wake up.
WF_PB
28B1[3]
0 –
R
Indicates that the PB caused the part to wake.
WF_RX
28B1[4]
0 –
R
Indicates that RX caused the part to wake.
WF_CSTART
WF_RST
WF_RSTBIT
WF_OVF
WF_ERST
WF_BADVDD
28B0[7]
28B0[6]
28B0[5]
28B0[4]
28B0[3]
28B0[2]
0
1
0
0
0
0
–
R
Indicates that the Reset pin, Reset bit, ERST pin, Watchdog timer, the cold
start detector, or bad VBAT caused the part to reset.