GMS36 datasheet(55/109 Pages) HYNIX

55 / 109 page

5-10

(17) RTN

Naming :

Return from Subroutine

Status :

Set

Format :

Function :

à SR1

PA, PB

à PSR1

SR1

à SR2

PSR1

à PSR2

SR2

à SR3

PSR2

à PSR3

SR3

à SR3

PSR3

à PSR2

à 1

Control is returned from the called subroutine to the calling

program.

Control is returned to its home routine by transferring to the PC

the data of the return address that has been saved in the stack

At the same time, data of the page stack register (PSR1) is

transferred to the PA and PB.

(18) LPBI i

Naming :

Load Page Buffer Register from Immediate

Status :

Set

Format :

Operand :

ROM page address 0

õ i õ 15

Function :

à i

A new ROM page address is loaded into the page buffer

This loading is necessary for a long branch or call instruction.

The PB register is loaded together with three bits from 4 bit

operand.

(19) AM

Naming :

Add Accumulator to Memory and Status 1 on Carry

Status :

Carry to status

Format :

Function :

à M(X,Y)+A, ST à 1(when total>15),

à 0 (when total õ15)

Data in the memory location addressed by the X and Y-register

is added to data of the accumulator. Results are stored in the

accumulator. Carry data as results is transferred to status.

When the total is more than 15, a carry is caused to put

Ì1Ì

in the status. Data in the memory is not changed.

Chapter 5. INSTRUCTION

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