HT82K74E datasheet(40/56 Pages) HOLTEK

40 / 56 page

CALL addr

Subroutine call

Description

Unconditionally calls a subroutine at the specified address. The Program Counter then in-

crements by 1 to obtain the address of the next instruction which is then pushed onto the

stack. The specified address is then loaded and the program continues execution from this

new address. As this instruction requires an additional operation, it is a two cycle instruc-

tion.

Operation

Stack

¬ Program Counter + 1

Program Counter

¬ addr

Affected flag(s)

None

CLR [m]

Clear Data Memory

Description

Each bit of the specified Data Memory is cleared to 0.

Operation

[m]

¬ 00H

Affected flag(s)

None

CLR [m].i

Clear bit of Data Memory

Description

Bit i of the specified Data Memory is cleared to 0.

Operation

[m].i

¬ 0

Affected flag(s)

None

CLR WDT

Clear Watchdog Timer

Description

The TO, PDF flags and the WDT are all cleared.

Operation

WDT cleared

¬ 0

PDF

¬ 0

Affected flag(s)

TO, PDF

CLR WDT1

Pre-clear Watchdog Timer

Description

The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunc-

tion with CLR WDT2 and must be executed alternately with CLR WDT2 to have effect. Re-

petitively executing this instruction without alternately executing CLR WDT2 will have no

effect.

Operation

WDT cleared

¬ 0

PDF

¬ 0

Affected flag(s)

TO, PDF

CLR WDT2

Pre-clear Watchdog Timer

Description

The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunc-

tion with CLR WDT1 and must be executed alternately with CLR WDT1 to have effect. Re-

petitively executing this instruction without alternately executing CLR WDT1 will have no

effect.

Operation

WDT cleared

¬ 0

PDF

¬ 0

Affected flag(s)

TO, PDF

HT82K74E/HT82K74EE

Rev. 1.00

December 15, 2009

HT82K74E Datasheet(PDF) 40 Page - Holtek Semiconductor Inc

HT82K74E Datasheet(HTML) 40 Page - Holtek Semiconductor Inc

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