HT49C10 datasheet(41/47 Pages) HOLTEK

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SBC A,[m]

Subtract data memory and carry from the accumulator

Description

Thecontentsofthespecifieddatamemoryandthecomplementofthecarryflag

aresubtractedfromtheaccumulator,leavingtheresultintheaccumulator.

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 zero

Description

The contents of the specified data memory are decremented by one. If the re-

sult is zero, the next instruction is skipped. If the result is zero, the following

instruction, fetched during the current instruction execution, is discarded

and a dummy cycle is replaced to get the proper instruction (two cycles). Oth-

erwise 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 zero

Description

The contents of the specified data memory are decremented by one. If the re-

sult is zero, the next instruction is skipped. The result is stored in the accu-

mulator but the data memory remains unchanged. If the result is zero, the

following instruction, 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, ACC ¬ ([m]-1)

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT49C10

September 28, 1999

HT49C10 Scheda tecnica(PDF) 41 Page - Holtek Semiconductor Inc

HT49C10 Scheda tecnica(HTML) 41 Page - Holtek Semiconductor Inc

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