Holtek HT66F0175 - Page 121

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
• SADC1 Register
Bit 7 6 5 4 3 2 1 0
Name SAINS2 SAINS10 SAINS0 — — SACKS2 SACKS1 SACKS0
R/W R/W R/W R/W — — R/W R/W R/W
POR 0 0 0 — — 0 0 0
Bit7~5 SAINS2~SAINS0:A/DConverterinputsignalselect
000,100:Externalsignal–Externalanalogchannelinput
001:Internalsignal–InternalA/DconverterpowersupplyvoltageV
DD
010:Internalsignal–InternalA/DconverterpowersupplyvoltageV
DD
/2
011:Internalsignal–InternalA/DconverterpowersupplyvoltageV
DD
/4
101:Internalsignal–InternalreferencevoltageV
R
110:Internalsignal–InternalreferencevoltageV
R
/2
111:Internalsignal–InternalreferencevoltageV
R
/4
Whentheinternalanalogsignalisselectedtobeconverted,theexternalchannelinput
signalwillautomaticallybeswitchedoffregardlessoftheSACS2~SACS0biteld
value.Theinternalreferencevoltagecanbederivedfromvarioussourcesselected
usingtheSAVRS3~SAVRS0bitsintheSADC2register.
Bit4~3 Unimplemented,readas“0”
Bit2~0 SACKS2~SACKS0:A/Dconversionclocksourceselect
000:f
SYS
001:f
SYS
/2
010:f
SYS
/4
011:f
SYS
/8
100:f
SYS
/16
101:f
SYS
/32
110:f
SYS
/64
111:f
SYS
/128
ThesebitsareusedtoselecttheclocksourcefortheA/Dconverter.