MAXQ61CA MAXIM [Maxim Integrated Products], MAXQ61CA Datasheet - Page 22

• Manufacturer Part Number: MAXQ61CA
• Description: 16-Bit Microcontroller with Infrared Module
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 3. Power-Fail Detection States During Normal Operation
16-Bit Microcontroller with Infrared Module
22
STATE
G
A
B
C
D
H
E
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
maintains this state for at least t
which time a power-fail interrupt is gener-
ated (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 turns on periodically.
V
Device held in reset. No operation allowed.
DD
POR
DD
RST
POR
DD
POR
DD
< V
> V
> V
< V
< V
< V
< V
< V
POR
RST
RST
POR
DD
DD
DD
DD
.
.
.
.
< V
< V
< V
< V
COMMENTS
PFW
RST
RST
RST
RST
.
.
.
.
< V
XTAL_RDY
XTAL_RDY
DD
< V
PFW
PFW
.
.
, at
and