MAXQ61HX-0000+ MAXIM [Maxim Integrated Products], MAXQ61HX-0000+ Datasheet - Page 20

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

16-Bit Microcontroller with Infrared Module
Figure 10. Stop Mode Power-Fail Detection with Power-Fail Monitor Disabled
Table 4. Stop Mode Power-Fail Detection States with Power-Fail Monitor Disabled
20
STATE
A
B
C
______________________________________________________________________________________
INTERNAL RESET
(ACTIVE HIGH)
POWER-FAIL
INTERRUPT
V
V
V
PFW
POR
RST
STOP
Off
Off
On
V
DD
A
REGULATOR
INTERNAL
Off
Off
On
B
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 interrupt that causes
stop mode exit.
DD
DD
RST
> V
< V
< V
RST
PFW
DD
.
.
< V
D
PFW
COMMENTS
.
XTAL_RDY
.
E
F