MAXQ61HX-0000+ MAXIM [Maxim Integrated Products], MAXQ61HX-0000+ Datasheet - Page 19

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

Figure 9. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
Table 3. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
STATE
A
B
C
D
E
F
INTERNAL RESET
(ACTIVE HIGH)
POWER-FAIL
(Periodically)
V
V
V
16-Bit Microcontroller with Infrared Module
PFW
POR
RST
STOP
On
On
On
On
On
Off
V
______________________________________________________________________________________
DD
REGULATOR
A
INTERNAL
Off
Off
On
Off
Off
Off
B
t < t
PFW
OSCILLATOR
CRYSTAL
t ≥ t
Off
Off
On
Off
Off
Off
PFW
C
RETENTION
SRAM
Yes
Yes
Yes
Yes
Yes
—
Application enters stop mode.
V
CPU in stop mode.
Power drop too short.
Power-fail not detected.
V
Power-fail warning detected.
Turn on regulator and crystal.
Crystal warmup time, t
Exit stop mode.
Application enters stop mode.
V
CPU in stop mode.
V
Power-fail detected.
CPU goes into reset.
Power-fail monitor is turned on periodically.
V
Device held in reset. No operation allowed.
DD
RST
DD
DD
POR
> V
> V
< V
< V
< V
RST.
RST.
POR.
DD
DD
< V
< V
D
PFW.
RST.
COMMENTS
XTAL_RDY
t ≥ t
PFW
.
E
F
19