GMS36 datasheet(56/109 Pages) HYNIX

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5-11

(20) SM

Naming :

Subtract Accumulator to Memory and Status 1 Not Borrow

Status :

Carry to status

Format :

Function :

à M(X,Y) - A

à 1(when A õ M(X,Y))

à 0(when A > M(X,Y))

Data of the accumulator is, through a 2`s complemental

addition, subtracted from the memory word addressed by the

Y-register. Results are stored in the accumulator. If data of

the accumulator is less than or equal to the memory word, the

status is set to indicate that a borrow is not caused.

If more than the memory word, a borrow occurs to reset the

status to

Ì0Ì.

(21) IM

Naming :

Increment Memory and Status 1 on Carry

Status :

Carry to status

Format :

Function :

à M(X,Y) + 1

à 1(when M(X,Y) ö 15)

à 0(when M(X,Y) < 15)

Data of the memory addressed by the X and Y-register is

fetched. Adding 1 to this word, results are stored in the

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

When the total is more than 15, the status is set. The memory

is left unchanged.

(22) DM

Naming :

Decrement Memory and Status 1 on Not Borrow

Status :

Carry to status

Format :

Function :

à M(X,Y) - 1

à 1(when M(X,Y) ö1)

à 0 (when M(X,Y) = 0)

Data of the memory addressed by the X and Y-register is

fetched, and one is subtracted from this word (addition of Fh)>

Results are stored in the accumulator. Carry data as results is

transferred to the status. If the data is more than or equal to

one, the status is set to indicate that no borrow is caused. The

memory is left unchanged.

Chapter 5. INSTRUCTION

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