HT47C20 datasheet(41/56 Pages) HOLTEK

41 / 56 page

CALL addr

Subroutine call

Description

The instruction unconditionally calls a subroutine located at the indi-

cated address. The program counter increments once to obtain the ad-

dress of the next instruction, and pushes this onto the stack. The

indicated address is then loaded. Program execution continues with the

instruction at this address.

Operation

Stack ¬ PC+1

PC ¬ addr

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

CLR [m]

Clear data memory

Description

The contents of the specified data memory are cleared to zero.

Operation

[m] ¬ 00H

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

CLR [m].i

Clear bit of data memory

Description

The bit i of the specified data memory is cleared to zero.

Operation

[m].i ¬ 0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

CLR WDT

Clear watchdog timer

Description

The WDT is cleared. The power down bit (PD) and time-out bit (TO) are

cleared.

Operation

WDT last two bits ¬ 00H

PD&TO ¬ 0

Affected flag(s)

TC2 TC1

¾¾

¾¾¾¾

HT47C20

January 18, 2000

HT47C20 Scheda tecnica(PDF) 41 Page - Holtek Semiconductor Inc

HT47C20 Scheda tecnica(HTML) 41 Page - Holtek Semiconductor Inc

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