HT49C50L Ver la hoja de datos (PDF) - Holtek Semiconductor

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HT49C50L

LCD Type 8-Bit MCU

Holtek Semiconductor 

SBC A,[m]

Description

Operation

Affected flag(s)

SBCM A,[m]

Description

Operation

Affected flag(s)

SDZ [m]

Description

Operation

Affected flag(s)

SDZA [m]

Description

Operation

Affected flag(s)

SET [m]

Description

Operation

Affected flag(s)

SET [m].i

Description

Operation

Affected flag(s)

HT49R50A-1/HT49C50-1/HT49C50L

Subtract Data Memory from ACC with Carry

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.

ACC ¬ ACC - [m] - C

OV, Z, AC, C

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

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.

[m] ¬ ACC - [m] - C

OV, Z, AC, C

Skip if decrement Data Memory is 0

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.

[m] ¬ [m] - 1

Skip if [m] = 0

None

Skip if decrement Data Memory is zero with result in ACC

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.

ACC ¬ [m] - 1

Skip if ACC = 0

None

Set Data Memory

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

[m] ¬ FFH

None

Set bit of Data Memory

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

[m].i ¬ 1

None

Rev. 2.40

35

July 30, 2012

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