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HT45F56 Datasheet(PDF) 42 Page - Holtek Semiconductor Inc

Part # HT45F56
Description  Shock Detector Flash MCU
PDF  90 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F56 Datasheet(HTML) 42 Page - Holtek Semiconductor Inc

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Rev. 1.11
42
April 11, 2017
Rev. 1.11
43
April 11, 2017
HT45F56
Shock Detector Flash MCU
HT45F56
Shock Detector Flash MCU
PullingtheRESPinlowusingexternalhardwarewillalsoexecuteadevicereset.Inthiscase,asin
thecaseofotherresets,theProgramCounterwillresettozeroandprogramexecutioninitiatedfrom
thispoint.
Internal Reset
tRSTD+tSST
RES
0.9VDD
0.4VDD
Note:tRSTDispower-ondelaywithtypicaltime=16.7ms
RES Reset Timing Chart
Thereisaninternalresetcontrolregister,RSTC,whichisusedtoprovidearesetwhenthedevice
operatesabnormallyduetotheenvironmentalnoiseinterference.IfthecontentoftheRSTCregister
issettoanyvalueotherthan01010101Bor10101010B,itwillresetthedeviceafter2~3fLIRCclock
cycles.Afterpowerontheregisterwillhaveavalueof01010101B.
RSTC7 ~ RSTC0 Bits
Reset Function
01010101B
I/O or other functions
10101010B
RES function
Any other value
Reset MCU
Reset Function Control
• RSTC Register
Bit
7
6
5
4
3
2
1
0
Name
RSTC7
RSTC6
RSTC5
RSTC4
RSTC3
RSTC2
RSTC1
RSTC0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
1
0
1
0
1
0
1
Bit7~0
RSTC7~RSTC0:Resetfunctioncontrol
01010101:I/Oorotherfunctions
10101010:RESfunction
Othervalues:ResetMCU
Ifthesebitsarechangedduetoadverseenvironmentalconditions,themicrocontroller
willbereset.Theresetoperationwillbeactivatedafter2~3LIRCclockcyclesand
theRSTFbitintheSMOD1registerwillbesetto1.Allresetwillresetthisregisteras
PORvalueexcepttheWDTtime-outreset.



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