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PM0044 датащи(PDF) 36 Page - STMicroelectronics

номер детали PM0044
подробное описание детали  STM8 CPU programming manual
PDF  162 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 датащи(HTML) 36 Page - STMicroelectronics

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STM8 addressing modes
PM0044
36/162
Doc ID 13590 Rev 3
6.3.1
Short Direct addressing mode
The address is a byte, thus require only one byte after the op-code, but only allow 00..FF
addressing space.
Example:
004B
20
coeff
dc.b
$20
052D
B64B
LD
A,coeff
Action:
A = (coeff) = ($4B) = $20
Figure 8.
Short Direct addressing mode example
Steps to Determine
Effective Address
PC = 052D
PC = PC + 1 = 052E
EA
Before Completion
Instruction Complete
A = (EA) = 20
New PC =
052F
After Completion
= (PC)
= (4B + 0000)
= 004B
20
B6
4B
LD A,Coeff
A
004B
EA
052D
PC
Previous Value
A
20
052F
New PC
004B
052D
052E
052F
Coeff .byte 20h
VR02059L
20
B6
4B
004B
052D
052E
052F
Coeff .byte 20h
LD A,Coeff
PC +1 =



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