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SDZA [m]

Decrement data memory-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 execution, is

discarded and a dummy cycle is replaced to get the proper instruction, 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

–

––

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

–

––

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

–

––

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 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]+1)=0, [m]

← ([m]+1)

Affected flag(s)

TC2

TC1

–

––

HT9480

23th Feb ’98

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