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PM0044 数据表(PDF) 42 Page - STMicroelectronics

部件名 PM0044
功能描述  STM8 CPU programming manual
PDF  162 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM0044 数据表(HTML) 42 Page - STMicroelectronics

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STM8 addressing modes
PM0044
42/162
Doc ID 13590 Rev 3
6.4.3
SP Indexed addressing mode
The offset is a byte, thus require only one byte after the op-code, but only allow 00..(FF +
stack top) addressing space.
Example:
Figure 13.
SP Indexed - 8-bit offset - addressing mode example
0086
4B11
PUSH #$11
0087
4B22
PUSH #$22
0088
4B33
PUSH #$33
0089
7B03
LD A,($03,SP)
Action:
A = ($03, SP) = ($03, $1FFC) = ($1FFF) = $11
Previous Value
A
Steps to determine
effective address
PC = 0089
PC = PC + 1 = 008A
EA = (PC) + SP=03+1FFC= 1FFF
Before completion
Instruction Complete
A = (EA) = 11
New PC = PC+1 = 008B
After completion
1FFF
1FFC
SP
A
11
SP
1FFC
New PC
008B
7B
03
33
22
Adder
EA
1FFD
0089
008A
008B
1FFE
1FFF
LD A, ($03,SP)
VR02059D
1FFC
11
PC
0089
1FFC
03
7B
03
33
22
1FFD
0089
008A
008B
1FFE
1FFF
LD A, ($03,SP)
1FFC
11



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