HT82K68 datasheet(34/40 Pages) HOLTEK

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SBC A,[m]

Subtract data memory and carry from the accumulator

Description

Thecontentsofthespecifieddatamemoryandthecomplementofthecarryflag

aresubtractedfromtheaccumulator,leaving theresultintheaccumulator.

Operation

ACC ¬ ACC+[m]+C

Affected flag(s)

TC2 TC1

ÖÖÖÖ

SBCM A,[m]

Subtract data memory and carry from the accumulator

Description

The contents of the specified data memory and the complement of the carry

flag are subtracted from the accumulator, leaving the result in the data

memory.

Operation

[m] ¬ ACC+[m]+C

Affected flag(s)

TC2 TC1

ÖÖÖÖ

SDZ [m]

Skip if decrement data memory is 0

Description

The contents of the specified data memory are decremented by 1. If the result

is 0, the next instruction is skipped. If the result is 0, the following instruc-

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

dummy cycle is replaced to get the proper instruction (two cycles). Otherwise

proceed with the next instruction (one cycle).

Operation

Skip if ([m]-1)=0, [m] ¬ ([m]-1)

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SDZA [m]

Decrement data memory and place result in ACC, skip if 0

Description

The contents of the specified data memory are decremented by 1. If the result

is 0, the next instruction is skipped. The result is stored in the accumulator

but the data memory remains unchanged. If the result is 0, the following in-

struction, 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]-1)=0, ACC ¬ ([m]-1)

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT82K68E

August 8, 2000

Preliminary

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