HT9480 datasheet(55/57 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

––

–

√√

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

–

––

SWAPA [m]

Swap data memory-place result in accumulator

encryption

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

–

––

SZ [m]

Skip if data memory is zero

Description

If the contents of the specified data memory is zero, the following instruction,

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

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

Otherwise proceed with the next instruction.

Operation

Skip if [m]=0

Affected flag(s)

TC2

TC1

–

––

HT9480

23th Feb ’98

HT9480 Datasheet(PDF) 55 Page - Holtek Semiconductor Inc

HT9480 Datasheet(HTML) 55 Page - Holtek Semiconductor Inc

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