HMS81C4324 데이터 시트보기 (PDF) - Hynix Semiconductor

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HMS81C4324

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION

Hynix Semiconductor 

HMS81C43xx / GMS87C4060

8.4 Addressing Mode

The GMS800 series uses six addressing modes;

• Register addressing

• Immediate addressing

• Direct page addressing

• Absolute addressing

• Indexed addressing

• Register-indirect addressing

(1) Register Addressing

Register addressing accesses the A, X, Y, C and PSW.

(2) Immediate Addressing → #imm

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

immediately.

Example:

FE10: 0435

ADC

#35H

MEMORY

0FE10H

04

35

A+35H+C → A

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

address which is composed of 8-bit direct page accessable

register (DPGR) and 8-bit immediate data.

Example: G=1, DPGR=0CH

F100: E45535 LDM

35H,#55H

0C35H

data

~~

þ

0F100H

E4

0F101H

55

0F102H

35

data ← 55H

~~

A

(3) Direct Page Addressing → dp

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

Example; G=0

E551: C535

LDA

35H;A ←RAM[35H]

35H

data

~~

0E550H

C5

0E551H

35

À

~~ þ data → A

(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;

F100: 0735F0 ADC!0F035H ;A ←ROM[0F035H]

0F035H

data

~~

0F100H

07

0F101H

35

0F102H

F0

A

~~

A+data+C → A

P

address: 0F035

26

N ovem ber 2001 ver 1.2

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