MAXQ61HX-0000+ MAXIM [Maxim Integrated Products], MAXQ61HX-0000+ Datasheet - Page 18

• Manufacturer Part Number: MAXQ61HX-0000+
• Description: 16-BIt Microcontroller with Infrared Module
• Manufacturer: MAXIM [Maxim Integrated Products]

16-Bit Microcontroller with Infrared Module
Table 2. Power-Fail Detection States During Normal Operation
18
STATE
G
A
B
C
D
E
H
F
I
______________________________________________________________________________________
POWER-FAIL
(Periodically)
(Periodically)
On
On
On
On
On
On
On
On
Off
REGULATOR
INTERNAL
Off
On
On
On
On
Off
On
Off
Off
OSCILLATOR
CRYSTAL
Off
On
On
On
On
Off
On
Off
Off
RETENTION
SRAM
Yes
Yes
—
—
—
—
—
—
—
V
V
Crystal warmup time, t
CPU held in reset.
V
CPU normal operation.
Power drop too short.
Power-fail not detected.
V
PFI is set when V
this state for at least t
fail interrupt is generated (if enabled).
CPU continues normal operation.
V
Power-fail detected.
CPU goes into reset.
Power-fail monitor turns on periodically.
V
Crystal warmup time, t
CPU resumes normal operation from 8000h.
V
Power-fail detected.
CPU goes into reset.
Power-fail monitor is turned on periodically.
V
Device held in reset.
No operation allowed.
DD
DD
RST
DD
DD
POR
POR
POR
< V
> V
> V
< V
< V
< V
< V
< V
RST
RST.
POR.
POR.
DD
DD
DD
DD
.
< V
< V
< V
< V
PFW
RST.
RST.
RST.
RST
COMMENTS
.
< V
PFW
XTAL_RDY
XTAL_RDY
DD
, at which time a power-
< V
PFW
.
.
and maintains