GMS81C7216 Datasheet, PDF (31/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
8.5 Addressing Mode
The G(H)MS800 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 imme-
diately.
Example:
0435 ADC #35H
MEMORY
04
A+35H+C → A
35
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, RPR=01
E45535 LDM 35H,#55H
0135H
data
~~
➊
0F100H
E4
0F101H
55
0F102H
35
data← 55H
~~
➋
(3) Direct Page Addressing → dp
In this mode, a address is specified within direct page.
Example; G=0
C535
LDA 35H
;A ←RAM[35H]
35H
data
~~
0E550H
C5
0E551H
35
➋
~~ _➊ data → A
FEB. 2005 Ver 1.04
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