HT45FH4M
Lithium Battery Backup Power ASSP MCU
STATUS Register
Bit
Name
R/W
7
6
5
TO
R
4
PDF
R
3
OV
R/W
×
2
Z
1
AC
R/W
×
0
—
—
—
—
—
—
C
R/W
R/W
×
POR
0
0
×
"×" ꢀnknown
Bitꢀ7ꢀ~ꢀ6ꢀ
Bitꢀ5ꢀ
Unimplemented,ꢀreadꢀasꢀ"0"
TO:ꢀWatchdogꢀTime-Outꢀflagꢀ
ꢀ 0:ꢀAfterꢀpowerꢀupꢀorꢀexecutingꢀtheꢀ"CLRꢀWDT"ꢀorꢀ"HALT"ꢀinstructionꢀ
ꢀ 1:ꢀAꢀwatchdogꢀtime-outꢀoccurred.
Bitꢀ4ꢀ
Bitꢀ3ꢀ
PDF:ꢀPowerꢀdownꢀflagꢀ
ꢀ 0:ꢀAfterꢀpowerꢀupꢀorꢀexecutingꢀtheꢀ"CLRꢀWDT"ꢀinstructionꢀ
ꢀ 1:ꢀByꢀexecutingꢀtheꢀ"HALT"ꢀinstruction
OV:ꢀOverflowꢀflagꢀ
ꢀ 0:ꢀnoꢀoverflowꢀ
ꢀ 1:ꢀanꢀoperationꢀresultsꢀinꢀaꢀcarryꢀintoꢀtheꢀhighest-orderꢀbitꢀbutꢀnotꢀaꢀcarryꢀoutꢀofꢀtheꢀꢀ
ꢀꢀꢀꢀꢀꢀꢀhighest-orderꢀbitꢀorꢀviceꢀversa.
Bitꢀ2ꢀ
Bitꢀ1ꢀ
Z:ꢀZeroꢀflagꢀ
ꢀ 0:ꢀTheꢀresultꢀofꢀanꢀarithmeticꢀorꢀlogicalꢀoperationꢀisꢀnotꢀzeroꢀ
ꢀ 1:ꢀTheꢀresultꢀofꢀanꢀarithmeticꢀorꢀlogicalꢀoperationꢀisꢀzero
AC:ꢀAuxiliaryꢀflagꢀ
ꢀ 0:ꢀnoꢀauxiliaryꢀcarryꢀ
ꢀ 1:ꢀanꢀoperationꢀresultsꢀinꢀaꢀcarryꢀoutꢀofꢀtheꢀlowꢀnibblesꢀinꢀaddition,ꢀorꢀnoꢀborrowꢀꢀ
ꢀꢀꢀꢀꢀꢀꢀfromꢀtheꢀhighꢀnibbleꢀintoꢀtheꢀlowꢀnibbleꢀinꢀsubtraction
Bitꢀ0ꢀ
C:ꢀCarryꢀflagꢀ
ꢀ 0:ꢀnoꢀcarry-outꢀ
ꢀ 1:ꢀanꢀoperationꢀresultsꢀinꢀaꢀcarryꢀduringꢀanꢀadditionꢀoperationꢀorꢀifꢀaꢀborrowꢀdoesꢀnotꢀ
ꢀꢀꢀꢀꢀꢀꢀtakeꢀplaceꢀduringꢀaꢀsubtractionꢀoperation
Cꢀisꢀalsoꢀaffectedꢀbyꢀaꢀrotateꢀthroughꢀcarryꢀinstruction.
Rev. 1.10
ꢅ6
�anꢀaꢁꢂ 1ꢃꢄ ꢅ01ꢆ