Bit microcontroller with infrared module maxq613 – Rainbow Electronics MAXQ613 User Manual
Page 25
16-Bit Microcontroller with Infrared Module
MAXQ613
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Table 5. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
Figure 12. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
V
PFW
V
RST
V
POR
A
B
C
D
E
F
V
DD
t
< t
PFW
t
≥ t
PFW
t
≥ t
PFW
STOP
INTERNAL RESET
(ACTIVE HIGH)
STATE
POWER-FAIL
INTERNAL
REGULATOR
CRYSTAL
OSCILLATOR
SRAM
RETENTION
COMMENTS
A
On
Off
Off
Yes
Application enters stop mode.
V
DD
> V
RST
.
CPU in stop mode.
B
On
Off
Off
Yes
Power drop too short.
Power-fail not detected.
C
On
On
On
Yes
V
RST
< V
DD
< V
PFW
.
Power-fail warning detected.
Turn on regulator and crystal.
Crystal warmup time, t
XTAL_RDY
.
Exit stop mode.
D
On
Off
Off
Yes
Application enters stop mode.
V
DD
> V
RST
.
CPU in stop mode.
E
On
(Periodically)
Off
Off
Yes
V
POR
< V
DD
< V
RST
.
Power-fail detected.
CPU goes into reset.
Power-fail monitor turns on periodically.
F
Off
Off
Off
—
V
DD
< V
POR
.
Device held in reset. No operation allowed.