參數(shù)資料
型號(hào): μPD70F3008
廠商: NEC Corp.
英文描述: 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
中文描述: 16/32位單片機(jī)微控制器(16/32位單片微控制器)
文件頁數(shù): 121/141頁
文件大?。?/td> 374K
代理商: ΜPD70F3008
109
CHAPTER 8 PIPELINE
(4) HALT
[Pipeline]
– : Idle inserted for wait
[Description]
The pipeline consists of 5 stages, IF, ID, EX, MEM and WB. No operation is performed in the
MEM and WB stages, because memory is not accessed and no data is written to registers. Also,
for the next instruction, the ID stage is delayed until the HALT state is released.
(5) TRAP
[Pipeline]
IF x :
ID1 :
ID2 :
Instruction fetch that is not executed
Trap code detect
Address generate
[Description]
The pipeline consists of 6 stages, IF, ID1, ID2, EX, MEM, and WB. However, no operation is
performed in the MEM stage, because memory is not accessed. The ID stage requires 2 clocks.
Also, the IF stage of the next instruction and next to next instruction is not executed.
(6) RETI
[Pipeline]
IF x :
ID1 :
ID2 :
Instruction fetch that is not executed
Register select
Read EIPC/FEPC
[Description]
The pipeline consists of 6 stages, IF, ID1, ID2, EX, MEM, and WB. However, no operation is
performed in the MEM and WB stages, because memory is not accessed and no data is written
to registers. The ID stage requires 2 clocks. Also, the IF stage of the next instruction and next
to next instruction is not executed.
IF
ID1
IF
×
ID2
EX
MEM
TRAP instruction
Next instruction
1
2
3
4
5
6
WB
IF
ID
EX
MEM
WB
7
8
9
Jump destination instruction
IF
ID1
IF
×
ID2
EX
MEM
RETI instruction
Next instruction
1
2
3
4
5
6
WB
IF
ID
EX
MEM
WB
7
8
9
Jump destination instruction
IF
ID
IF
EX
MEM
1
2
3
4
5
6
WB
IF
ID
EX
MEM
ID
EX
MEM
WB
WB
HALT
instruction
Next
instruction
Next to next instruction
HALT release
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