HT47C20 datasheet(51/56 Pages) HOLTEK

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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

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

accumulator but the data memory remains unchanged. If the result is

zero ,the following instruction, fetched during the current instruction ex-

ecution, is discarded and a dummy cycle is replaced to get the proper in-

struction, that makes a 2-cycle instruction. Otherwise proceed with the

next instruction.

Operation

Skip if ([m]-1)=0, ACC ¬ ([m]-1)

Affected flag(s)

TC2 TC1

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SET [m]

Set data memory

Description

Each bit of the specified data memory is set to one.

Operation

[m] ¬ FFH

Affected flag(s)

TC2 TC1

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SET [m].i

Set bit of data memory

Description

Bit i of the specified data memory is set to one.

Operation

[m].i ¬ 1

Affected flag(s)

TC2 TC1

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SIZ [m]

Skip if increment data memory is zero

Description

The contents of the specified data memory is incremented by one. If the

result is zero, the following instruction, fetched during the current in-

struction 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]+1)=0, [m] ¬ ([m]+1)

Affected flag(s)

TC2 TC1

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HT47C20

January 18, 2000

HT47C20 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc

HT47C20 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc

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