PIC16LC8X View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16LC8X Datasheet PDF : 117 Pages
| |||
PIC16C8X
NOP
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
No Operation
[ label ] NOP
None
No operation
None
00 0000
No operation.
1
1
NOP
0xx0
0000
RETFIE
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example
Return from Interrupt
[ label ] RETFIE
None
TOS → (PC),
1 → GIE
None
00 0000 0000 1001
The Stack is popped and Top of Stack
(TOS) is loaded into the PC. Interrupts
are enabled by setting the Global
Interrupt Enable bit. This is a two
cycle instruction.
1
2
RETFIE
After Interrupt
PC = TOS
GIE = 1
OPTION
Load Option Register
Syntax:
[ label ] OPTION
Operands:
None
Operation:
(W) → OPTION
Status Affected: None
Encoding:
00 0000 0110 0010
Description:
The contents of the W register are
loaded in the OPTION register. This
instruction is supported for code com-
patibility with PIC16C5X products.
Since OPTION is a readable/writable
register, the user can directly address
it.
Words:
1
Cycles:
1
Example
Note:
To maintain upward compatibility with
future PIC16CXX products, do not use
this instruction.
RETLW
Return Literal to W
Syntax:
[ label ] RETLW k
Operands:
0 ≤ k ≤ 255
Operation:
k → (W),
TOS → (PC)
Status Affected: None
Encoding:
11 01xx kkkk kkkk
Description:
The W register is loaded with the eight
bit literal 'k'. The program counter is
loaded from the top of the stack (the
return address). This is a two cycle
instruction.
Words:
1
Cycles:
2
Example
CALL TABLE ;W contains table
;offset value
•
;W now has table value
•
•
TABLE ADDWF PC ;W = offset
RETLW k1 ;Begin table
RETLW k2 ;
•
•
•
RETLW kn ; End of table
Before Instruction
W = 0x07
After Instruction
W = value of k7
© 1995 Microchip Technology Inc.
DS30081F-page 61
Share Link: 