HT47C20 Holtek Semiconductor Inc, HT47C20 Datasheet - Page 42

• Manufacturer Part Number: HT47C20
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

CLR WDT1
Description
Operation
Affected flag(s)
CLR WDT2
Description
Operation
Affected flag(s)
CPL [m]
Description
Operation
Affected flag(s)
Preclear watchdog timer
The PD, TO flags and WDT are cleared, if the other preclear WDT in-
struction had been executed. Only execution of this instruction without
the other preclear instruction sets the indicating flag which implies that
this instruction was executed and the PD and TO flags remain un-
changed.
WDT last two bits ¬ 00H*
PD and TO ¬ 0*
Preclear watchdog timer
The PD, TO flags and WDT are cleared, if the other preclear WDT in-
struction had been executed. Only execution of this instruction without
the other preclear instruction sets the indicating flag which implies that
this instruction was executed and the PD and TO flags remain un-
changed.
WDT last two bits ¬ 00H*
PD and TO ¬ 0*
Complement data memory
Each bit of the specified data memory is logically complemented (1 s
complement). Bits which previously contain a one are changed to zero
and vice-versa.
[m]¬ [m]
TC2
TC2
TC2
¾
¾
¾
TC1
TC1
TC1
¾
¾
¾
TO
TO
TO
0*
0*
¾
42
PD
PD
PD
0*
0*
¾
OV
OV
OV
¾
¾
¾
¾
¾
Z
Z
Z
Ö
AC
AC
AC
¾
¾
¾
¾
¾
¾
C
C
C
January 18, 2000
HT47C20