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HT66F019 Datasheet(PDF) 53 Page - Holtek Semiconductor Inc

Part # HT66F019
Description  A/D Flash MCU with EEPROM
PDF  175 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F019 Datasheet(HTML) 53 Page - Holtek Semiconductor Inc

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Rev. 1.00
5�
De�e��e� 01� �01�
Rev. 1.00
53
De�e��e� 01� �01�
HT66F019
A/D Flash MCU with EEPROM
HT66F019
A/D Flash MCU with EEPROM
• LVRC Register
Bit
7
6
5
4
3
2
1
0
Na�e
LVS�
LVS6
LVS5
LVS4
LVS3
LVS�
LVS1
LVS0
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
LVS7~LVS0:LVRVoltageSelectcontrol
01010101:2.1V
00110011:2.55V
10011001:3.15V
10101010:3.8V
Anyothervalue:GeneratesMCUreset–registerisresettoPORvalue
Whenanactuallowvoltageconditionoccurs,asspecifiedbyoneofthefourdefined
LVRvoltagevaluesabove,anMCUresetwillbegenerated.Theresetoperation
willbeactivatedafterthelowvoltageconditionkeepsmorethanatLVRtime.Inthis
situationtheregistercontentswillremainthesameaftersucharesetoccurs.
Anyregistervalue,otherthanthefourdefinedLVRvaluesabove,willalsoresultin
thegenerationofanMCUreset.Theresetoperationwillbeactivatedafteradelay
time,tSRESET.HoweverinthissituationtheregistercontentswillberesettothePOR
value.
• CTRL Register
Bit
7
6
5
4
3
2
1
0
Na�e
FSYSON
—
—
—
—
LVRF
LRF
WRF
R/W
R/W
—
—
—
—
R/W
R/W
R/W
POR
0
—
—
—
—
x
0
0
"x": unknown
Bit7
FSYSON:fSYScontrolinIDLEMode
Describeelsewhere.
Bit6~3
Unimplemented,readas"0"
Bit2
LVRF:LVRfunctionresetflag
0:Notoccur
1:Occurred
ThisbitissethighwhenaspecificLowVoltageResetsituationconditionoccurs.This
bitcanonlybeclearedtozerobytheapplicationprogram.
Bit1
LRF:LVRcontrolregistersoftwareresetflag
0:Notoccur
1:Occurred
Thisbitissetto1iftheLVRCregistercontainsanynon-definedLVRvoltageregister
values.Thisineffectactslikeasoftware-resetfunction.Thisbitcanonlybeclearedto
0bytheapplicationprogram.
Bit0
WRF:WDTControlregistersoftwareresetflag
Describeelsewhere.
Watchdog Time-out Reset during Normal Operation
TheWatchdogtime-outResetduringnormaloperationintheFASTorSLOWmodeisthesameas
LVRresetexceptthattheWatchdogtime-outflagTOwillbesethigh.
WDT Ti�e-out
Inte�nal Reset
tRSTD + tSST
WDT Time-out Reset during Normal Operation Timing Chart



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