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HT67F488 датащи(PDF) 95 Page - Holtek Semiconductor Inc

номер детали HT67F488
подробное описание детали  TinyPowerTM A/D Flash MCU with LCD & EEPROM
PDF  171 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT67F488 датащи(HTML) 95 Page - Holtek Semiconductor Inc

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Rev. 1.60
95
�ove��e� ��� �016
HT67F488/HT67F489
TinyPowerTM A/D Flash MCU with LCD & EEPROM
ADCR1 Register
Bit
7
6
5
4
3
2
1
0
�a�e
ACS4
VBGE�
VREFS
ADCK�
ADCK1
ADCK0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
Bit7
ACS4:SelectinternalVBGasADCinputcontrol
0:Disable
1:Enable
ThisbitenablesVBGtobeconnectedtotheA/Dconverter.TheVBGENbitmust
firsthavebeensettoenablethebandgapcircuitVBGvoltagetobeusedbytheA/D
converter.WhentheACS4bitissethigh,thebandgapVBGvoltagewillberoutedto
theA/DconverterandtheotherA/Dinputchannelsdisconnected.
Bit6
VBGEN:InternalVBGcontrol
0:Disable
1:Enable
ThisbitcontrolstheinternalBandgapcircuiton/offfunctiontotheA/Dconverter.
WhenthebitissethighthebandgapvoltageVBGcanbeusedbytheA/Dconverter.If
VBGisnotusedbytheA/DconverterandtheLVR/LVDfunctionisdisabledthenthe
bandgapreferencecircuitwillbeautomaticallyswitchedofftoconservepower.When
VBGisswitchedonforusebytheA/Dconverter,atimetBGshouldbeallowedforthe
bandgapcircuittostabilisebeforeimplementinganA/Dconversion.
Bit5
Unimplemented,readas“0”
Bit4
VREFS:SelecteADCreferencevoltage
0:InternalADCpower
1:VREFpin
ThisbitisusedtoselectthereferencevoltagefortheA/Dconverter.Ifthebitishigh,
thentheA/DconverterreferencevoltageissuppliedontheexternalVREFpin.Ifthe
pinislow,thentheinternalreferenceisusedwhichistakenfromthepowersupplypin
VDD.WhentheA/DconverterreferencevoltageissuppliedontheexternalVREFpin
whichispin-sharedwithotherfunctions,allofthepin-sharedfunctionsexceptVREF
onthispinaredisabled.
Bit3
Unimplemented,readas“0”
Bit2~0
ADCK2~ADCK0:SelectADCclocksource
000:fSYS
001:fSYS/2
010:fSYS/4
011:fSYS/8
100:fSYS/16
101:fSYS/32
110:fSYS/64
111:Undefined
ThesethreebitsareusedtoselecttheclocksourcefortheA/Dconverter.



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