HT47C20 datasheet(52/56 Pages) HOLTEK

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SIZA [m]

Increment data memory and place result in ACC, skip if zero

Description

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

result is zero, the next instruction is skipped and the result stored in the

accumulator. The data memory remains unchanged. If the result is zero,

the following instruction, fetched during the current instruction execu-

tion, is discarded and a dummy cycle replaced to get the proper instruc-

tion. This is a 2-cycle instruction. Otherwise proceed with the next

instruction.

Operation

Skip if ([m]+1)=0, ACC ¬ ([m]+1)

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SNZ [m].i

Skip if bit i of the data memory is not zero

Description

If bit i of the specified data memory is not zero, the next instruction is

skipped. If bit i of the data memory is not zero, the following instruction,

fetched during the current instruction execution, is discarded and a

dummy cycle is replaced to get the proper instruction. This is a 2-cycle in-

struction. Otherwise proceed with the next instruction.

Operation

Skip if [m].i¹0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

SUB A,[m]

Subtract data memory from accumulator

Description

The specified data memory is subtracted from the contents of the accu-

mulator, leaving the result in the accumulator.

Operation

ACC ¬ ACC+[m]+1

Affected flag(s)

TC2 TC1

ÖÖÖÖ

SUBM A,[m]

Subtract data memory from accumulator

Description

The specified data memory is subtracted from the contents of the accu-

mulator, leaving the result in the data memory.

Operation

[m] ¬ ACC [m]+1

Affected flag(s)

TC2 TC1

ÖÖÖÖ

HT47C20

January 18, 2000

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