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PM0044 数据表(PDF) 29 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) 29 Page - STMicroelectronics

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PM0044
Pipelined execution
Doc ID 13590 Rev 3
29/162
5.4.5
Pipeline with 1 wait state
In the example given in Table 14, performing the fetch takes 2 cycles, and there is no
overlap between the 2 fetch cycles.
If the instruction is decoded/executed during the last 2 fetch cycles, then the wait state is
transparent compared to the no-wait state execution.
Table 14.
Pipeline with 1 wait state
Address
Instruction
Decode
cycles
Execute
cycles
lgth
Time (cycle)
12
34
5
6
7
8
9
10
0xC000
NEG A
1
1
1
MS
F1
D
E
0xC001
DEC ($10, X)
1
1
3
D
E
0xC004
LDW X, #20
1
1
3
MS
F2
D
E
E
0xC007
LD (X), A
1
1
1
D
D
E
0xC008
INC A
1
1
1
MS
F3
D
E
0xC009
NEG ($5A, Y)
1
1
1
D
E
Table 15.
Legend
Symbol/Color
Definition
FFetch
D
Decode stalled
DDecode
MS
Memory stalled
EExecute



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