DSPIC30F datasheet(27/248 Pages) MICROCHIP

27 / 248 page

 2004 Microchip Technology Inc.

Preliminary

DS70083G-page 25

dsPIC30F

One-word, two-cycle instructions that are not

flow control instructions: the only instructions of

this type are the

MOV.D (load and store double-

word) instructions, as shown in Figure 2-4.

FIGURE 2-4:

INSTRUCTION PIPELINE FLOW: 1-WORD, 2-CYCLE MOV.D OPERATIONS

Table read/write instructions: these instructions

will suspend the fetching to insert a read or write

cycle to the program memory. The instruction

fetched while executing the table operation is

saved for 1 cycle and executed in the cycle

immediately after the table operation as shown

in Figure 2-5.

FIGURE 2-5:

INSTRUCTION PIPELINE FLOW: 1-WORD, 2-CYCLE TABLE OPERATIONS

Two-word instructions for CALL and GOTO: in

these instructions, the fetch after the instruction

provides the remainder of the jump or call desti-

nation address. These instructions require 2

cycles to execute, 1 cycle to fetch the 2 instruc-

tion words (enabled by a high speed path on the

second fetch), and 1 cycle to flush the pipeline

as shown in Figure 2-6.

FIGURE 2-6:

INSTRUCTION PIPELINE FLOW: 2-WORD, 2-CYCLE GOTO, CALL

CY0TCY1TCY2TCY3TCY4TCY5

1. MOV

W0,0x1234

Fetch 1

Execute 1

2. MOV.D [W0++],W1

Fetch 2

Execute 2

R/W Cycle 1

3. MOV

W1,0x00AA

Fetch 3

Execute 2

R/W Cycle2

3a. Stall

Stall

Execute 3

4. MOV

0x0CC, W0

Fetch 4

Execute 4

CY0TCY1TCY2TCY3TCY4TCY5

1. MOV #0x1234,W0

Fetch 1

Execute 1

2. TBLRDL [W0++],W1

Fetch 2

Execute 2

3. MOV #0x00AA,W1

Fetch 3

Execute 2

Read Cycle

3a. Table Operation

Bus Read

Execute 3

4. MOV

#0x0CC,W0

Fetch 4

Execute 4

CY0TCY1TCY2TCY3TCY4TCY5

1. MOV #0x1234,W0

Fetch 1

Execute 1

2. GOTO LABEL

Fetch 2L

Update PC

2a. Second Word

Fetch 2H

NOP

3. Instruction @ address LABEL

Fetch

LABEL

Execute

LABEL

4. BSET

W1, #BIT3

Fetch 4

Execute 4

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