HT45F12
8-Bit Flash MCU with Op Amps & Comparators
Bitꢀ1ꢀ
Bitꢀ0ꢀ
AC:ꢀAuxiliaryꢀflagꢀ
ꢀ 0:ꢀNoꢀauxiliaryꢀcarryꢀ
ꢀ 1:ꢀAnꢀoperationꢀresultsꢀinꢀaꢀcarryꢀoutꢀofꢀtheꢀlowꢀnibblesꢀinꢀaddition,ꢀorꢀnoꢀborrowꢀꢀ
ꢀꢀꢀꢀꢀꢀꢀfromꢀtheꢀhighꢀnibbleꢀintoꢀtheꢀlowꢀnibbleꢀinꢀsubtraction
C:ꢀCarryꢀflagꢀ
ꢀ 0:ꢀNoꢀcarry-outꢀ
ꢀ 1:ꢀAnꢀoperationꢀresultsꢀinꢀaꢀcarryꢀduringꢀanꢀadditionꢀoperationꢀorꢀifꢀaꢀborrowꢀdoesꢀꢀ
ꢀꢀꢀꢀꢀꢀꢀnotꢀtakeꢀplaceꢀduringꢀaꢀsubtractionꢀoperation
Cꢀisꢀalsoꢀaffectedꢀbyꢀaꢀrotateꢀthroughꢀcarryꢀinstruction.
System Control Register – CTRL
Thisꢀregisterꢀisꢀusedꢀtoꢀprovideꢀcontrolꢀoverꢀvariousꢀinternalꢀfunctions.ꢀSomeꢀofꢀtheseꢀincludeꢀtheꢀ
certainꢀsystemꢀclockꢀoptions,ꢀtheꢀLVRꢀcontrol,ꢀWatchdogꢀTimerꢀfunction.
CTRL Register
Bit
Naꢁe
R/W
7
F�Y�ON
R/W
6
5
4
3
2
LVRF
R/W
x
1
0
WRF
—
—
—
—
—
—
—
—
—
—
—
—
LRF
R/W
0
R/W
POR
0
0
"x" unknown
Bitꢀ7ꢀꢀ
FSYSON:ꢀfSYSꢀControlꢀinꢀIDLEꢀModeꢀ
ꢀ 0:ꢀDisableꢀ
ꢀ 1:ꢀEnable
Bitꢀ6~3ꢀ
Bitꢀ2ꢀ
Unimplemented,ꢀreadꢀasꢀ"0"
LVRF:ꢀLVRꢀfunctionꢀresetꢀflagꢀ
ꢀ 0:ꢀNotꢀoccurꢀ
ꢀ 1:ꢀOccurred
Thisꢀbitꢀisꢀsetꢀtoꢀ1ꢀwhenꢀaꢀspecificꢀLowꢀVoltageꢀResetꢀsituationꢀconditionꢀoccurs.ꢀThisꢀ
bitꢀcanꢀonlyꢀbeꢀclearedꢀtoꢀ0ꢀbyꢀtheꢀapplicationꢀprogram.
bitꢀ1ꢀ
bitꢀ0ꢀ
LRF:ꢀLVRꢀControlꢀregisterꢀsoftwareꢀresetꢀflagꢀ
ꢀ 0:ꢀNotꢀoccurꢀ
ꢀ 1:ꢀOccurred
Thisꢀbitꢀisꢀsetꢀtoꢀ1ꢀifꢀtheꢀLVRCꢀregisterꢀcontainsꢀanyꢀnonꢀdefinedꢀLVRꢀvoltageꢀregisterꢀ
values.ꢀThisꢀinꢀeffectꢀactsꢀlikeꢀaꢀsoftware-resetꢀfunction.ꢀThisꢀbitꢀcanꢀonlyꢀbeꢀclearedꢀtoꢀ
0ꢀbyꢀtheꢀapplicationꢀprogram.
WRF:ꢀWDTꢀControlꢀregisterꢀsoftwareꢀresetꢀflagꢀ
ꢀ 0:ꢀNotꢀoccurꢀ
ꢀ 1:ꢀOccurred
Thisꢀbitꢀisꢀsetꢀtoꢀ1ꢀbyꢀtheꢀWDTꢀControlꢀregisterꢀsoftwareꢀresetꢀandꢀclearedꢀbyꢀtheꢀ
applicationꢀprogram.ꢀNoteꢀthatꢀthisꢀbitꢀcanꢀonlyꢀbeꢀclearedꢀtoꢀ0ꢀbyꢀtheꢀapplicationꢀ
program.
Rev. 0.00
ꢄ8
�eꢀteꢁꢂeꢃ ꢄꢅꢆ ꢄ01ꢄ
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
