PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 44
PIC18F258
Manufacturer Part Number
PIC18F258
Description
High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F258.pdf
(384 pages)
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PIC18FXX8
EXAMPLE 4-2:
EXAMPLE 4-3:
DS41159B-page 42
MOVLW 055h
GOTO 000006h
MOVFF 123h, 456h
1. MOVLW 55h
2. MOVWF PORTB
3. BRA SUB_1
4. BSF
5. Instruction @ address SUB_1
Note:
PORTA, BIT3 (Forced NOP)
Instruction
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.
—
—
INSTRUCTION PIPELINE FLOW
INSTRUCTIONS IN PROGRAM MEMORY
Fetch 1
T
CY
0
EF03h, F000h
C123h, F456h
Execute 1
Fetch 2
Opcode
T
0E55h
CY
1
Preliminary
Execute 2
Fetch 3
T
CY
2
Execute 3
Fetch 4
Memory
T
CY
0Eh
EFh
F0h
C1h
F4h
55h
03h
00h
23h
56h
3
Fetch SUB_1
Flush
2002 Microchip Technology Inc.
T
CY
4
Execute SUB_1
Address
00000Ah
00000Bh
00000Ch
00000Dh
00000Eh
00000Fh
000007h
000008h
000009h
000010h
000011h
000012h
T
CY
5
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