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PM0044 Datasheet(PDF) 41 Page - STMicroelectronics

No. de pieza PM0044
Descripción Electrónicos  STM8 CPU programming manual
PDF  162 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 Datasheet(HTML) 41 Page - STMicroelectronics

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PM0044
STM8 addressing modes
Doc ID 13590 Rev 3
41/162
6.4.2
Short Indexed addressing mode
The offset is a byte, thus requires only one byte after the op-code, but only allows 00..1FE
addressing space.
Example:
Figure 12.
Short Indexed - 8-bit offset - addressing mode example
0089
11223344
table
dc.l
$11223344
0759
AE03
LD
X,#3
075B
E689
LD
A,(table,X)
Action:
X = 3
A = (table, X) = ($89, X) = ($89, 3) = ($8C) = $44
Previous Value
03
A
X
Steps to determine
Effective Address
PC = 075B
PC = PC + 1 = 075C
EA = (PC) + X = 89 + 03 = 008C
Before completion
Instruction Complete
A = (EA) = 44
New PC = PC + 1 = 075D
After Completion
008C
075B
PC
A
44
X
03
New PC
075D
11
22
33
44
E6
89
E6
89
Adder
EA
075B
075B
0089
008A
008B
008C
075C
075D
0089
008A
008B
008C
075C
075D
LD A, (table,X)
LD A, (table,X)
VR02059D
Table .long 11223344
Table .long 11223344
11
22
33
44
89
03



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