HMS81032TL datasheet(28/77 Pages) HYNIX

28 / 77 page

HMS81004E/08E/16E/24E/32E

JUNE 2001 Ver 1.00

8.5 Addressing Mode

The HMS81004E/08E/16E/24E/32E 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 difined by 16-bit

address which is composed of 8-bit RAM paging register

(RPR) and 8-bit immediate data.

Example: G=1, RPR=0CH

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;

A+35H+C

→ A

MEMORY

0F100H

data

← 55H

data

0C35H

0F102H

0F101H

data

35H

0E551H

data

→ A

0E550H

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