GMS36 datasheet(57/109 Pages) HYNIX

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5-12

(23) IA

Naming :

Increment Accumulator

Status :

Set

Format :

Function :

à A+1

Data of the accumulator is incremented by one. Results are

returned to the accumulator.

A carry is not allowed to have effect upon the status.

(24) IY

Naming :

Increment Y-Register and Status 1 on Carry

Status :

Carry to status

Format :

Function :

à Y + 1

à 1 (when Y = 15)

à 0 (when Y < 15)

Data of the Y-register is incremented by one and results are

returned to the Y-register.

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

total is more than 15, the status is set.

(25) DA

Naming :

Decrement Accumulator and Status 1 on Borrow

Status :

Carry to status

Format :

Function :

à A - 1

à 1(when A ö1)

à 0 (when A = 0)

Data of the accumulator is decremented by one. As a result

(by addition of Fh), if a borrow is caused, the status is reset to

Ì0Ì by logic. If the data is more than one, no borrow occurs

and thus the status is set to

Ì1Ì.

Chapter 5. INSTRUCTION

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