HT37B90 datasheet(74/80 Pages) HOLTEK

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SBC A,[m]

SubtractDataMemoryfrom ACC withCarry

Description

The contents of the specified Data Memory and the complement of the carry flag are sub-

tracted from the Accumulator. The result is stored in the Accumulator. Note that if the result

of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or

zero,theCflagwillbesetto1.

Operation

ACC

¬ ACC - [m] - C

Affectedflag(s)

OV,Z,AC,C

SBCM A,[m]

SubtractDataMemoryfrom ACC withCarryandresultinDataMemory

Description

The contents of the specified Data Memory and the complement of the carry flag are sub-

tracted from the Accumulator. The result is stored in the Data Memory. Note that if the re-

sult of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is

positiveorzero,theCflagwillbesetto1.

Operation

[m]

¬ ACC - [m] - C

Affectedflag(s)

OV,Z,AC,C

SDZ [m]

SkipifdecrementDataMemoryis0

Description

The contents of the specified Data Memory are first decremented by 1. If the result is 0 the

following instruction is skipped. As this requires the insertion of a dummy instruction while

the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program

proceedswiththefollowinginstruction.

Operation

[m]

¬ [m] - 1

Skipif[m]=0

Affectedflag(s)

None

SDZA [m]

SkipifdecrementDataMemoryiszerowithresultin ACC

Description

The contents of the specified Data Memory are first decremented by 1. If the result is 0, the

following instruction is skipped. The result is stored in the Accumulator but the specified

Data Memory contents remain unchanged. As this requires the insertion of a dummy in-

struction while the next instruction is fetched, it is a two cycle instruction. If the result is not

0,theprogramproceedswiththefollowinginstruction.

Operation

ACC

¬ [m] - 1

Skipif ACC =0

Affectedflag(s)

None

SET[m]

SetDataMemory

Description

EachbitofthespecifiedDataMemoryissetto1.

Operation

[m]

¬ FFH

Affectedflag(s)

None

SET[m].i

SetbitofDataMemory

Description

Bit i ofthespecifiedDataMemoryissetto1.

Operation

[m].i

¬ 1

Affectedflag(s)

None

HT37B90/HT37B70/HT37B50/HT37B30

Rev.1.00

June22,2017

HT37B90 Datasheet(PDF) 74 Page - Holtek Semiconductor Inc

HT37B90 Datasheet(HTML) 74 Page - Holtek Semiconductor Inc

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