HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 25
HMS87C5216
Manufacturer Part Number
HMS87C5216
Description
CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
Manufacturer
ETC1 [List of Unclassifed Manufacturers]
Datasheet
1.HMS87C5216.pdf
(76 pages)
- Current page: 25 of 76
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9.4 Addressing Mode
The HMS87C5216 and GMS81C1408 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 imme-
diately.
Example:
0435
E45535
SEP. 2004 Ver 1.01
0F100
0F101
0F102
0035
þ
H
H
H
H
~ ~
ADC
LDM
MEMORY
data
E4
35
35
04
55
#35H
35H,#55H
~ ~
data
A+35H+C
#imm
À
55H
A
(3) Direct Page Addressing
In this mode, a address is specified within direct page.
Example;
C535
(4) Absolute Addressing
Absolute addressing sets corresponding memory data to Data, i.e.
second byte(Operand I) of command becomes lower level ad-
dress 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
0F035
0F100
0F101
0F102
0F550
0F551
H
H
H
H
0035
~ ~
LDA
ADC
H
H
H
~ ~
data
07
35
F0
35H
!0F035H
data
C5
35
~ ~
þ
~ ~
!abs
address: 0F035
dp
;A
;A
þ
À
A+data+C
À
RAM[35H]
ROM[0F035H]
HMS87C5216
data
A
A
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