HT82K94E datasheet(35/43 Pages) HOLTEK

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RRCA [m]

Rotate right through carry and place result in the accumulator

Description

Data of the specified data memory and the carry flag are rotated 1 bit right. Bit 0 replaces

the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is

stored in the accumulator. The contents of the data memory remain unchanged.

Operation

ACC.i

¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)

ACC.7

¬ C

¬ [m].0

Affected flag(s)

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SBC A,[m]

Subtract data memory and carry from the accumulator

Description

The contents of the specified data memory and the complement of the carry flag are sub-

tracted from the accumulator, leaving the result in the accumulator.

Operation

ACC

¬ ACC+[m]+C

Affected flag(s)

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SBCM A,[m]

Subtract data memory and carry from the accumulator

Description

The contents of the specified data memory and the complement of the carry flag are sub-

tracted from the accumulator, leaving the result in the data memory.

Operation

[m]

¬ ACC+[m]+C

Affected flag(s)

PDF

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SDZ [m]

Skip if decrement data memory is 0

Description

The contents of the specified data memory are decremented by 1. If the result is 0, the next

instruction is skipped. If the result is 0, the following instruction, fetched during the current

instruction execution, is discarded and a dummy cycle is replaced to get the proper instruc-

tion (2 cycles). Otherwise proceed with the next instruction (1 cycle).

Operation

Skip if ([m]

-1)=0, [m] ¬ ([m]-1)

Affected flag(s)

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SDZA [m]

Decrement data memory and place result in ACC, skip if 0

Description

The contents of the specified data memory are decremented by 1. If the result is 0, the next

instruction is skipped. The result is stored in the accumulator but the data memory remains

unchanged. If the result is 0, the following instruction, fetched during the current instruction

execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cy-

cles). Otherwise proceed with the next instruction (1 cycle).

Operation

Skip if ([m]

-1)=0, ACC ¬ ([m]-1)

Affected flag(s)

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HT82K94E/HT82K94A

Rev. 1.50

October 11, 2007

HT82K94E bảng dữ liệu(PDF) 35 Page - Holtek Semiconductor Inc

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