HT82K68 datasheet(37/40 Pages) HOLTEK

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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-place result in the accumulator

Description

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

changed, 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 0

Description

If the contents of the specified data memory are 0, the following instruction,

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

cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed

with the next instruction (2 cycle).

Operation

Skip if [m]=0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SZA [m]

Move data memory to ACC, skip if 0

Description

The contents of the specified data memory are copied to the accumulator. If

the contents is 0, the following instruction, fetched during the current in-

struction execution, is discarded and a dummy cycle is replaced to get the

proper instruction (2 cycles). Otherwise proceed with the next instruction (1

cycle).

Operation

Skip if [m]=0, ACC ¬ [m]

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT82K68E

August 8, 2000

Preliminary

HT82K68 Datasheet(PDF) 37 Page - Holtek Semiconductor Inc

HT82K68 Datasheet(HTML) 37 Page - Holtek Semiconductor Inc

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