HT47C20 datasheet(42/56 Pages) HOLTEK

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CLR WDT1

Preclear watchdog timer

Description

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.

Operation

WDT last two bits ¬ 00H*

PD and TO ¬ 0*

Affected flag(s)

TC2 TC1

¾¾

¾¾¾¾

CLR WDT2

Preclear watchdog timer

Description

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.

Operation

WDT last two bits ¬ 00H*

PD and TO ¬ 0*

Affected flag(s)

TC2 TC1

¾¾

¾¾¾¾

CPL [m]

Complement data memory

Description

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.

Operation

[m]¬ [m]

Affected flag(s)

TC2 TC1

¾Ö¾

HT47C20

January 18, 2000

HT47C20 Folha de dados(PDF) 42 Page - Holtek Semiconductor Inc

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