Holtek HT66F0175 - Page 120

Rev. 1.50 120 August 28, 2017 Rev. 1.50 121 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
• SADC0 Register
Bit 7 6 5 4 3 2 1 0
Name START ADBZ ADCEN ADRFS — SACS2 SACS1 SACS0
R/W R/W R R/W R/W — R/W R/W R/W
POR 0 0 0 0 — 0 0 0
Bit7 START:StarttheA/DConversion
0→1→0:Start
ThisbitisusedtoinitiateanA/Dconversionprocess.Thebitisnormallylowbutifset
highandthenclearedlowagain,theA/Dconverterwillinitiateaconversionprocess.
Bit6 ADBZ:A/DConverterbusyag
0:NoA/Dconversionisinprogress
1:A/Dconversionisinprogress
ThisreadonlyagisusedtoindicatewhethertheA/Dconversionisinprogressor
not.WhentheSTARTbitissetfromlowtohighandthentolowagain,theADBZag
willbesetto1toindicatethattheA/Dconversionisinitiated.TheADBZagwillbe
clearedto0aftertheA/Dconversioniscomplete.
Bit5 ADCEN:A/DConverterfunctionenablecontrol
0:Disable
1:Enable
ThisbitcontrolstheA/Dinternalfunction.Thisbitshouldbesettoonetoenable
theA/Dconverter.Ifthebitissetlow,thentheA/Dconverterwillbeswitchedoff
reducingthedevicepowerconsumption.WhentheA/Dconverterfunctionisdisabled,
thecontentsoftheA/Ddataregisterpair,SADOH/SADOL,willkeepunchanged.
Bit4 ADRFS:A/Dconversiondataformatselect
0:A/Dconverterdataformat→SADOH=D[11:4];SADOL=D[3:0]
1:A/Dconverterdataformat→SADOH=D[11:8];SADOL=D[7:0]
Thisbitcontrolstheformatofthe12-bitconvertedA/DvalueinthetwoA/Ddata
registers.DetailsareprovidedintheA/Dconverterdataregistersection.
Bit3 Unimplemented,readas“0”
Bit2~0 SACS2~SACS0:A/Dconverterexternalanaloginputchannelselect
000:AN0
001:AN1
010:AN2
011:AN3
100:AN4
101:AN5
110:AN6
111:AN7