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GMS81C2112 Datasheet(PDF) 36 Page - Hynix Semiconductor

No. de Pieza. GMS81C2112
Descripción  HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
Descarga  107 Pages
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Fabricante  HYNIX [Hynix Semiconductor]
Página de inicio  http://www.skhynix.com/ko/index.jsp
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GMS81C2112 Datasheet(HTML) 36 Page - Hynix Semiconductor

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GMS81C2112/GMS81C2120
30
JUNE. 2001 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
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:
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
;A
←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
;A
←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.
35
A+35H+C
A
04
MEMORY
E4
0F100H
data ¨ 55H
~
~
~
~
data
0135H
–
35
0F102H
55
0F101H
—
data
35
35H
0E551H
data
A
—
–
~
~
~
~
C5
0E550H
07
0F100H
~
~
~
~
data
0F035H
–
F0
0F102H
35
0F101H
—
A+data+C
A
address: 0F035


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