GMS81C50 Datasheet, PDF(34/99 Page) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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GMS81C50 Datasheet, PDF (34/99 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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HYUNDAI

GMS81C50 Series

The operation within data memory (RAM)

ASL, BIT, DEC, INC, LSR, ROL, ROR

Example; Addressing accesses the address 0135H regard-

less of G-flag and RPR.

983501 INC !0135H

;A âROM[135H]

135H

data

0F100H

0F101H

0F102H

~~ Â

data+1 â data

address: 0135

X indexed direct page, auto incrementâ {X}+

In this mode, a address is specified within direct page by

the X register and the content of X is increased by 1.

LDA, STA

Example; G=0, X=35H

LDA {X}+

35H

data

data â A

Â 36H â X

(5) Indexed Addressing

X indexed direct page (no offset) â {X}

In this mode, a address is specified by the X register.

ADC, AND, CMP, EOR, LDA, OR, SBC, STA, XMA

Example; X=15H, G=1, RPR=01H

LDA {X}

;ACCâRAM[X].

115H

data

0E550H

data â A

X indexed direct page (8 bit offset) â dp+X

This address value is the second byte (Operand) of com-

mand plus the data of -register. And it assigns the mem-

ory in Direct page.

ADC, AND, CMP, EOR, LDA, LDY, OR, SBC, STA

STY, XMA, ASL, DEC, INC, LSR, ROL, ROR

Example; G=0, X=0F5H

C645 LDA 45H+X

3AH

data

0E550H

0E551H

Â data â A

45H+0F5H=13AH

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