MAXQ622G-0000 MAXIM [Maxim Integrated Products], MAXQ622G-0000 Datasheet - Page 32

• Manufacturer Part Number: MAXQ622G-0000
• Description: 16-Bit Microcontrollers with Infrared Module and Optional USB
• Manufacturer: MAXIM [Maxim Integrated Products]

16-Bit Microcontrollers with
Infrared Module and Optional USB
Figure 7. Stop Mode Power-Fail Detection with Power-Fail Monitor Disabled
Table 7. Stop Mode Power-Fail Detection States with Power-Fail Monitor Disabled
32
STATE
A
B
C
_____________________________________________________________________________________
INTERNAL RESET
(ACTIVE HIGH)
POWER-FAIL
INTERRUPT
V
V
V
PFW
POR
RST
Off
Off
On
STOP
V
DD
A
REGULATOR
INTERNAL
B
Off
Off
On
OSCILLATOR
CRYSTAL
Off
Off
On
C
RETENTION
SRAM
Yes
Yes
Yes
Application enters stop mode.
V
CPU in stop mode.
V
Power-fail not detected because power-fail
monitor is disabled.
V
An interrupt occurs that causes the CPU to
exit stop mode.
Power-fail monitor is turned on, detects a
power-fail warning, and sets the power-fail
interrupt flag.
Turn on regulator and crystal.
Crystal warmup time, t
On stop mode exit, CPU vectors to the
higher priority of power-fail and the inter-
rupt that causes stop mode exit.
DD
DD
RST
> V
< V
< V
D
RST
PFW
DD
.
.
< V
COMMENTS
PFW
.
XTAL_RDY
E
F
.