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SIZA [m]

Increment data memory-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 accumu-

lator. The data memory remains unchanged. If the result is zero, the follow-

ing instruction, fetched during the current instruction execution, is discarded

and a dummy cycle replaced to get the proper instruction. 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

–

––

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 instruction.

Otherwise proceed with the next instruction.

Operation

Skip if [m].i

≠0

Affected flag(s)

TC2

TC1

–

––

SUB A,[m]

Subtract data memory from accumulator

Description

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

tor, leaving the result in the accumulator.

Operation

ACC

← ACC+[m]+1

Affected flag(s)

TC2

TC1

––

–

√√

SUBM A,[m]

Subtract data memory from accumulator

Description

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

tor, leaving the result in the data memory.

Operation

[m]

← ACC [m]+1

Affected flag(s)

TC2

TC1

––

–

√√

HT9480

23th Feb ’98

HT9480 Datasheet(PDF) 54 Page - Holtek Semiconductor Inc

HT9480 Datasheet(HTML) 54 Page - Holtek Semiconductor Inc

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