PIC18F258-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

EXAMPLE 4-2: INSTRUCTION PIPELINE FLOW

1. MOVLW 55h

TCY0

Fetch 1

2. MOVWF PORTB

3. BRA SUB_1

4. BSF PORTA, BIT3 (Forced NOP)

5. Instruction @ address SUB_1

TCY1

Execute 1

Fetch 2

TCY2

Execute 2

Fetch 3

TCY3

TCY4

TCY5

Execute 3

Fetch 4

Flush

Fetch SUB_1

Execute SUB_1

Note: All instructions are single cycle, except for any program branches. These take two cycles, since the fetch instruction is

“flushed” from the pipeline while the new instruction is being fetched and then executed.

EXAMPLE 4-3: INSTRUCTIONS IN PROGRAM MEMORY

Instruction

Opcode

Memory

—

MOVLW 055h

GOTO 000006h

0E55h

0EF03h, 0F000h

55h

0Eh

03h

0EFh

00h

MOVFF 123h, 456h

—

0C123h, 0F456h

0F0h

23h

0C1h

56h

0F4h

Address

000007h

000008h

000009h

00000Ah

00000Bh

00000Ch

00000Dh

00000Eh

00000Fh

000010h

000011h

000012h

DS41159E-page 42

© 2006 Microchip Technology Inc.

Share Link: