HT9480 datasheet(52/57 Pages) HOLTEK

номер детали	HT9480

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производитель	HOLTEK [Holtek Semiconductor Inc]

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SBC A,[m]

Subtract data memory and carry from accumulator

Description

The contents of the specified data memory and the complement of the carry

flag are together subtracted from the accumulator, leaving the result in the

accumulator.

Operation

ACC

← ACC+[m]+C

Affected flag(s)

TC2

TC1

––

–

√√

SBCM A,[m]

Subtract data memory and carry from accumulator

Description

The contents of the specified data memory and the complement of the carry

flag are together subtracted from the accumulator, leaving the result in the

data memory.

Operation

[m]

← ACC+[m]+C

Affected flag(s)

TC2

TC1

––

–

√√

SDZ [m]

Skip if decrement data memory is zero

Description

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

result 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 replaced to get the proper instruction. This

makes 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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