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SBC A,[m]

Subtract Data Memory from ACC with Carry

Description

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

subtracted 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, the C flag will be set to 1.

Operation

ACC

¬ ACC - [m] - C

Affected flag(s)

OV, Z, AC, C

SBCM A,[m]

Subtract Data Memory from ACC with Carry and result in Data Memory

Description

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

subtracted from the Accumulator. The result is stored in the Data Memory. 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, the C flag will be set to 1.

Operation

[m]

¬ ACC - [m] - C

Affected flag(s)

OV, Z, AC, C

SDZ [m]

Skip if decrement Data Memory is 0

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 instruc-

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

the program proceeds with the following instruction.

Operation

[m]

¬ [m] - 1

Skip if [m] = 0

Affected flag(s)

None

SDZA [m]

Skip if decrement Data Memory is zero with result in 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 spec-

ified Data Memory contents remain unchanged. 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 proceeds with the following instruction.

Operation

ACC

¬ [m] - 1

Skip if ACC = 0

Affected flag(s)

None

SET [m]

Set Data Memory

Description

Each bit of the specified Data Memory is set to 1.

Operation

[m]

¬ FFH

Affected flag(s)

None

SET [m].i

Set bit of Data Memory

Description

Bit i of the specified Data Memory is set to 1.

Operation

[m].i

¬ 1

Affected flag(s)

None

Rev. 1.20

142

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

HT45F43 Datasheet(PDF) 142 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 142 Page - Holtek Semiconductor Inc

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