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PM0044 数据表(PDF) 28 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) 28 Page - STMicroelectronics

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Pipelined execution
PM0044
28/162
Doc ID 13590 Rev 3
register during the first execution cycle. As a result, in this cycle, the next instruction
(LD A,(X)) cannot be decoded since it reads the X register.
Table 12.
Example of stalled pipeline
Address
Instruction
Decode
cycles
Execute
cycles
lgth
Time (cycles)
1
234
7
8
9
10
11
12
13
14
0xC000
SUB SP, #20
1
1
2
F1
D
E
0xC002
LD A, #20
1
1
2
D
E
0xC004
BTJT 0x10, #5, to
1
2
5
F2
F3
D
E
E
0xC009
INC A
1
1
1
D
D
E
0xC00A
BTJF 0x20, #3, to
1
2
5
F1
D
E
E
0xC00F
NOP
X
X
1
0xC010
LDW X,[$5432.w]
X
X
4
F2
0xC014
LDW X,[$1234.w]
X
X
4
F3
0xD020
to: INCW Y
1
1
2
F1
D
E
0xD023
LD A,(X)
1
1
2
D
D
E
Table 13.
Legend
Symbol/Color
Definition
FFetch
D
Decode stalled
DDecode
EExecute



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