HMS87C5216 Datasheet, PDF (68/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

HMS87C5216
Low Voltage (V)
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0℃
10℃
20℃
30℃
40℃
50℃
60℃
70℃
Temperature(℃)
Figure 17-5 Low Voltage vs Temperature
(4) SRAM BACK-UP after Low Voltage Detection.
3.0V
about hours depend on Vcc-Gnd Capacitor
MCU OPR.
Voltage
1.8V(TYP)
( 20℃)
Low Voltage Detection
point
Power On Reset
( SRAM retention)
0.7V(VRET)
0V
* SRAM Data Backup
Power On Reset
( SRAM unstable )
User
Removes
Batteries
* The operation after Low voltage detection
Interrupt : disable
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
User
Replace
Batteries
Figure 17-6 Low Voltage Detection and Protection
SEP. 2004 Ver 1.01