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DSPIC30F bảng dữ liệu(PDF) 26 Page - Microchip Technology

tên linh kiện DSPIC30F
Giải thích chi tiết về linh kiện  General Purpose and Sensor Families High-Performance Digital Signal Controllers
PDF  248 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DSPIC30F bảng dữ liệu(HTML) 26 Page - Microchip Technology

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dsPIC30F
DS70083G-page 24
Preliminary
 2004 Microchip Technology Inc.
2.3
Instruction Flow
There are 8 types of instruction flows:
1.
Normal one-word, one-cycle instructions: these
instructions take one effective cycle to execute
as shown in Figure 2-2.
FIGURE 2-2:
INSTRUCTION PIPELINE FLOW: 1-WORD, 1-CYCLE
2.
One-word, two-cycle (or three-cycle) instruc-
tions that are flow control instructions: these
instructions include the relative branches, rela-
tive call, skips and returns. When an instruction
changes the PC (other than to increment it), the
pipelined fetch is discarded. This causes the
instruction to take two effective cycles to exe-
cute as shown in Figure 2-3. Some instructions
that change program flow require 3 cycles, such
as the RETURN, RETFIE and RETLW instruc-
tions, and instructions that skip over 2-word
instructions.
FIGURE 2-3:
INSTRUCTION PIPELINE FLOW: 1-WORD, 2-CYCLE
T
CY0TCY1TCY2TCY3TCY4TCY5
1. MOV.b #0x55,W0
Fetch 1
Execute 1
2. MOV.b #0x35,W1
Fetch 2
Execute 2
3. ADD.b W0,W1,W2
Fetch 3
Execute 3
T
CY0TCY1TCY2TCY3TCY4TCY5
1. MOV
#0x55,W0
Fetch 1
Execute 1
2. BTSC W1,#3
Fetch 2
Execute 2
Skip Taken
3. ADD
W0,W1,W2
Fetch 3
Flush
4. BRA
SUB_1
Fetch 4
Execute 4
5. SUB
W0,W1,W3
Fetch 5
Flush
6. Instruction @ address SUB_1
Fetch SUB_1



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