HT68F20 datasheet(179/210 Pages) HOLTEK

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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 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, 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 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

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 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

[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 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, 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

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev. 1.00

179

November 3, 2009

HT68F20 Datasheet(PDF) 179 Page - Holtek Semiconductor Inc

HT68F20 Datasheet(HTML) 179 Page - Holtek Semiconductor Inc

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