HMS81C4460 데이터 시트보기 (PDF) - Hynix Semiconductor

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HMS81C4460

8-BIT SINGLE-CHIP MICROCONTROLLERS

Hynix Semiconductor 

HMS81C4x60

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.

F100: 981501 INC !0115H ;A ←ROM[115H]

115H

data

~~

0F100H

98

0F101H

15

0F102H

01

Ã

~~ À

data+1 → data

þ

address: 0115

X indexed direct page, auto increment→ {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

F100: DB LDA {X}+

35H

data

~~

DB

À

~~

data → A

þ 36H → X

(5) Indexed Addressing

X indexed direct page (no offset) → {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

E550: D4 LDA {X}

;ACC←RAM[X].

115H

data

~~

0E550H

D4

À

~~

þ

data → A

X indexed direct page (8 bit offset) → 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

E550: C645 LDA 45H+X

3AH

data

~~

0E550H

C6

0E551H

45

~~

þ

Ã

À data → A

45H+0F5H=13AH

November 2001 Ver 1.1

29

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