HT69F2562 datasheet(66/194 Pages) HOLTEK

66 / 194 page

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HT69F2562

Ultra-Low Power Flash MCU with LCD & EEPROM

HT69F2562

Ultra-Low Power Flash MCU with LCD & EEPROM

capacitorconnectedbetweebVSSandtheRESpinwillprovideasuitableexternalresetcircuit.Any

wiringconnectedtotheRESpinshouldbekeptasshortaspossibletominimiseanystraynoise

interference.Forapplicationsthatoperatewithinanenvironmentwheremorenoiseispresentthe

EnhancedResetCircuitshownisrecommended.

VDD

RES

10kΩ~

100kΩ

0.01µF**

1N4148*

VSS

0.1µF~1µF

300Ω*

Note:“*”ItisrecommendedthatthiscomponentisaddedforaddedESDprotection.

“**”Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoise

issignificant.

External RES Circuit

PullingtheRESpinlowusingexternalhardwarewillalsoexecuteadevicereset.Inthiscase,asin

thecaseofotherresets,theProgranCounterwillresettozeroandprogramexecutioninitiatedfrom

thispoint.

Inte�nal Reset

tRSTD+tSST

RES

0.9VDD

0.4VDD

RES Reset Timing Chart

Thereisaninternalresetcontrolregister,RSTC,whichisusedtoselecttheexternalRESpin

functionandprovidearesetwhenthedeviceoperatesabnormallyduetotheenvironmentalnoise

interference.IfthecontentoftheRSTCregisterissettoanyvalueotherthan01010101Bor

10101010B,itwillresetthedeviceafteradelaytime,tSRESET.Afterpowerontheregisterwillhavea

valueof01010101B.

RSTC7 ~ RSTC0 Bits

Reset Function

01010101B

PB0

10101010B

RES

An� othe� val�e

Reset MCU

Internal Reset Function Control

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