HT48R10A datasheet(39/42 Pages) HOLTEK

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SUB A,x

Subtract immediate data from the 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 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 (1 cycle).

Operation

Skip if [m]=0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT48R10A-1

Rev. 1.20

July 2, 2001

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