HT46C22 datasheet(37/46 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)

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

HT46R22/HT46C22

Rev. 1.10

October 2, 2002

HT46C22 датащи(PDF) 37 Page - Holtek Semiconductor Inc

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