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PM0044 Folha de dados(PDF) 37 Page - STMicroelectronics

Nome de Peças PM0044
Descrição Electrónicos  STM8 CPU programming manual
PDF  162 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 Folha de dados(HTML) 37 Page - STMicroelectronics

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PM0044
STM8 addressing modes
Doc ID 13590 Rev 3
37/162
6.3.2
Long Direct addressing mode
The address is a word, thus allowing 0000 to FFFF addressing space, but requires 2 bytes
after the op-code.
Example:
0409
C606E5
LD
A,coeff
06E5
40
coeff
dc.b
$ 40
Action:
A = (coeff) = ($06E5) = $40
Figure 9.
Long Direct addressing mode example
Previous Value
0409
A
PC
E5
Steps to Determine
Effective Address
PC = 0409
PC = PC + 1 = 040A
EA = (PC) : (PC+1) = 06E5
PC + 2 =
Before Completion
40
040C
A
New PC
Instruction Complete
A = (EA) = 40
New PC =
040C
After Completion
C6
06E5
EA
06
40
06E5
E5
C6
06
40
040A
040B
040C
040A
040B
040C
0409
0409
06E5
06E5
VR02059B
LD A,Coeff
LD A,Coeff
Coeff .byte 040h
Coeff .byte 040h



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