GMS81C2012 datasheet(35/107 Pages) HYNIX

35 / 107 page

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

8.4 Addressing Mode

The GMS800 series MCU uses six addressing modes;

• Register addressing

• Immediate addressing

• Direct page addressing

• Absolute addressing

• Indexed addressing

• Register-indirect addressing

(1) Register Addressing

(2) Immediate Addressing

→

→ #imm

In this mode, second byte (operand) is accessed as a data

immediately.

Example:

0435

ADC

#35H

When G-flag is 1, then RAM address is defined by 16-bit

address which is composed of 8-bit RAM paging register

(RPR) and 8-bit immediate data.

Example: G=1

E45535

LDM

35H,#55H

(3) Direct Page Addressing

→

→ dp

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

Example; G=0

C535

LDA

35H

←RAM[35H]

(4) Absolute Addressing

→

→ !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

←ROM[0F035H]

The operation within data memory (RAM)

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

Example; Addressing accesses the address 0135H regard-

less of G-flag.

A+35H+C

→ A

MEMORY

0F100H

data ¨ 55H

data

0135H

0F102H

0F101H

data

35H

0E551H

data

→ A

0E550H

0F100H

data

0F035H

0F102H

0F101H

A+data+C

→ A

address: 0F035

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