GMS30004 datasheet(41/158 Pages) HYNIX

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(26) DY

Naming :

Decrement Y-Register and Status 1 on Not Borrow

Status :

Carry to status

Format :

Function :

à Y -1

à 1 (when Y ö 1)

à 0 (when Y = 0)

Data of the Y-register is decremented by one.

Data of the Y-register is decremented by one by addition of

minus 1 (Fh).

Carry data as results is transferred to the status. When the

results is equal to 15, the status is set to indicate that no

borrow has not occurred.

(27) EORM

Naming :

Exclusive or Memory and Accumulator

Status :

Set

Format :

Function :

à M(X,Y) + A

Data of the accumulator is, through a Exclusive OR,

subtracted from the memory word addressed by X and Y-

(28) NEGA

Naming :

Negate Accumulator and Status 1 on Zero

Status :

Carry to status

Format :

Function :

à A + 1

à 1(when A = 0)

à 0 (when A != 0)

The 2`s complement of a word in the accumulator is obtained.

The 2`s complement in the accumulator is calculated by adding

one to the 1`s complement in the accumulator. Results are

stored into the accumulator. Carry data is transferred to the

status. When data of the accumulator is zero, a carry is

caused to set the status to

Ì1Ì.

Chapter 3. Instruction

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