GMS82524 Datasheet, PDF(28/93 Page) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS82524 Datasheet, PDF (28/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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HYUNDAI MicroElectronics

GMS82512/16/24

(4) Absolute Addressing â !abs

Absolute addressing sets corresponding memory data to

Data, i.e. second byte (Operand I) of command becomes

lower level address and third byte (Operand II) becomes

upper level address.

With 3 bytes command, it is possible to access to whole

memory area.

ADC, AND, CMP, CMPX, CMPY, EOR, LDA, LDX,

LDY, OR, SBC, STA, STX, STY

Example;

0735F0 ADC !0F035H

;A âROM[0F035H]

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

Example; X=15H, G=1

LDA {X}

;ACCâRAM[X].

115H

data

0E550H

data â A

0F035H

data

0F100H

0F101H

0F102H

~~ Â A+data+C â A

address: 0F035

The operation within data memory (RAM)

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

Example; Addressing accesses the address 0135H regard-

less of G-flag.

983501 INC !0135H

;A âROM[135H]

135H

data

0F100H

0F101H

0F102H

~~ Â

data+1 â data

address: 0135

(5) Indexed Addressing

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

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

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 Ã A

Â 36H Ã X

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

FEB. 2000 Ver 1.00

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