GMS36 Datasheet, PDF (42/109 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 4. FUNCTIONAL DESCRIPTION
Built-in Low VDD Detection Circuit
GMS36/37XXX has a Low VDD detection circuit.
If VDD become Reset Voltage of Low VDD Detection circuit at active status, system
reset occur and WDT is cleared. After VDD is increased upper Reset Voltage again,
WDT is re-counted and if WDT is overflowed, system reset is released.
VDD
Reset Voltage
Internal
RESETB
About 108msec at fosc =455kHz
Fig. 4-5 Low Voltage Detection diagram
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Fig. 4-6 Low Voltage vs Temperature
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4-9