Chapter7. Reset Function
* SRAM BACK-UP after Low Voltage Detection.
3.0V
about hours depend on Vcc-Gnd Capacitor
MCU OPR.
Voltage
Low Voltage Detection
point
Power On Reset
( SRAM retention)
1.8V(TYP)
( 20¡ É)
Power On Reset
( SRAM unstable )
0.7V(VRET)
0V
* SRAM Data Backup
* The operation after Low voltage detection
Interrupt : disable
User
Replace
Batteries
User
Removes
Batteries
Stop release : disable
All I/O port : input Mode
Remout port : Low Level
OSC
: STOP
All I/O port pull-up ON (Mask Option )
SRAM Data retention
* S/W flow chart example after Reset using SRAM Back-up
RESET
Stack Pointer initialize
Check the SRAM value
(RAM Pattern, Check sum..)
N
Clear All Ram area
SRAM DATA IS VALID?
Y
Use saved SRAM
value
7 - 5
HYNIX [ HYNIX SEMICONDUCTOR ]
