HT48C50- datasheet(39/45 Pages) HOLTEK

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SBC 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 accumula-

tor.

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 (2 cycles). Otherwise

proceed with the next instruction (1 cycle).

Operation

Skip if ([m]-1)=0, [m] ¬ ([m]-1)

Affected flag(s)

TC2 TC1

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HT48C50-1

June 14, 2000

Preliminary

HT48C50- Datasheet(PDF) 39 Page - Holtek Semiconductor Inc