GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 30

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

HYUNDAI MicroElectronics
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
In this mode, second byte (operand) is accessed as a data
immediately.
Example:
0435
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.
DEC. 1999 Ver 1.04
ADC
MEMORY
35
04
#35H
A+35H+C
#imm
A
Example: G=1
E45535
(3) Direct Page Addressing
In this mode, a address is specified within direct page.
Example; G=0
C535
0E550H
0E551H
0F100H
0F101H
0F102H
0135H
35H
~ ~
~ ~
LDM
LDA
data
C5
data
35
E4
55
35
35H,#55H
35H
~ ~
~ ~
GMS81508B/16B/24B
data ¨ 55H
;A
dp
data
RAM[35H]
A
27