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HT45F56 数据表(PDF) 43 Page - Holtek Semiconductor Inc

部件名 HT45F56
功能描述  Shock Detector Flash MCU
PDF  90 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT45F56 数据表(HTML) 43 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
• SMOD1 Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
RSTF
LVRF
—
WRF
R/W
R/W
—
—
—
R/W
R/W
—
R/W
POR
0
—
—
—
0
x
—
0
“x”: unknown
Bit7
FSYSON:fSYScontrolinIDLEmode
Describedelsewhere.
Bit6~4
Unimplemented,readas“0”
Bit3
RSTF:Resetcontrolregistersoftwareresetflag
0:Notoccurred
1:Occurred
Thisbitissetto1bytheRSTCcontrolregistersoftwareresetandclearedbythe
applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplicationprogram.
Bit2
LVRF:LVRfunctionresetflag
Describedelsewhere.
Bit1
Unimplemented,readas“0”
Bit0
WRF:WDTcontrolregistersoftwareresetflag
Describedelsewhere.
Low Voltage Reset – LVR
Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe
device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupplyvoltage
ofthedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,
theLVRwillautomaticallyresetthedeviceinternallyandtheLVRFbitintheSMOD1registerwill
alsobesetto1.ForavalidLVRsignal,alowsupplyvoltage,i.e.,avoltageintherangebetween
0.9V~VLVR
mustexistforatimegreaterthanthatspecifiedbytLVRintheLVRcharacteristics.If
thelowsupplyvoltagestatedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltage
andwillnotperformaresetfunction.TheactualVLVR
valueis2.1VandtheLVRcircuitwillreset
thedevicewhenthesupplyvoltageislessthan2.1VformorethanthetLVR
time.NotethattheLVR
functionwillbeautomaticallydisabledwhenthedeviceentersthepowerdownmode.
LVR
Internal Reset
tRSTD + tSST
Note:tRSTDispower-ondelaywithtypicaltime=50ms
Low Voltage Reset Timing Chart



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