HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 68

• Manufacturer Part Number: HMS87C5216
• Description: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

HMS87C5216
(4) SRAM BACK-UP after Low Voltage Detection.
Figure 17-6 Low Voltage Detection and Protection
Figure 17-5 Low Voltage vs Temperature
0.7V(V
1.8V(TYP)
( 20℃)
MCU OPR.
Voltage
3.0V
0V
RET
)
User
Removes
Batteries
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
Low Voltage (V)
0℃
* The operation after Low voltage detection
about hours depend on Vcc-Gnd Capacitor
Low Voltage Detection
10℃
Interrupt
Stop release
All I/O port
Remout port : Low Level
OSC
All I/O port pull-up ON (Mask Option )
SRAM Data retention
* SRAM Data Backup
point
20℃
Temperature(℃)
: disable
: disable
: input Mode
: STOP
30℃
40℃
50℃
60℃
User
Replace
Batteries
70℃
( SRAM retention)
( SRAM unstable )
Power On Reset
Power On Reset
SEP. 2004 Ver 1.01