HT46R23 datasheet(37/42 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

C ¬ [m].0

Affected flag(s)

TC2

TC1

¾¾¾¾¾

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)

TC2

TC1

ÖÖÖÖ

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)

TC2

TC1

ÖÖÖÖ

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 in-

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

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

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

Operation

Skip if ([m]-1)=0, [m] ¬ ([m]-1)

Affected flag(s)

TC2

TC1

¾¾¾¾¾¾

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 in-

struction is skipped. The result is stored in the accumulator but the data memory remains un-

changed. 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 cycles).

Otherwise proceed with the next instruction (1 cycle).

Operation

Skip if ([m]-1)=0, ACC ¬ ([m]-1)

Affected flag(s)

TC2

TC1

¾¾¾¾¾¾

HT46R23

Rev. 1.30

August 17, 2001

HT46R23 датащи(PDF) 37 Page - Holtek Semiconductor Inc

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