HT47C20 datasheet(53/56 Pages) HOLTEK

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SUB A,x

Subtract immediate data from accumulator

Description

The immediate data specified by the code is subtracted from the contents

of the accumulator, leaving the result in the accumulator.

Operation

ACC ¬ ACC+x+1

Affected flag(s)

TC2 TC1

ÖÖÖÖ

SWAP [m]

Swap nibbles within the data memory

Description

The low-order and high-order nibbles of the specified data memory (one

of the data memories) are interchanged.

Operation

[m].3~[m].0 « [m].7~[m].4

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SWAPA [m]

Swap data memory and place result in accumulator

Description

The low-order and high-order nibbles of the specified data memory are

interchanged, writing the result to the accumulator. The contents of the

data memory remain unchanged.

Operation

ACC.3~ACC.0 ¬ [m].7~[m].4

ACC.7~ACC.4 ¬ [m].3~[m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SZ [m]

Skip if data memory is zero

Description

If the contents of the specified data memory is zero, the following instruc-

tion, fetched during the current instruction execution, is discarded and a

dummy cycle is replaced to get the proper instruction. This is a 2-cycle in-

struction. Otherwise proceed with the next instruction.

Operation

Skip if [m]=0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT47C20

January 18, 2000

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