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PIC16F84A Datasheet(PDF) 154 Page - Microchip Technology

Part # PIC16F84A
Description  8-Bit CMOS Microcontrollers
PDF  337 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F84A Datasheet(HTML) 154 Page - Microchip Technology

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PIC16C6X
DS30234D-page 154
© 1997 Microchip Technology Inc.
RETLW
Return with Literal in 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
Q Cycle Activity:
Q1
Q2
Q3
Q4
1st Cycle
Decode
Read
literal 'k'
No-
Operation
Write to W,
Pop from
the Stack
2nd Cycle
No-
Operation
No-
Operation
No-
Operation
No-
Operation
Example
TABLE
CALL TABLE
;W contains table
;offset value
•
;W now has table value
•
•
ADDWF PC
;W = offset
RETLW k1
;Begin table
RETLW k2
;
•
•
•
RETLW kn
; End of table
Before Instruction
W
=
0x07
After Instruction
W
=
value of k8
RETURN
Return from Subroutine
Syntax:
[
label ]
RETURN
Operands:
None
Operation:
TOS
→ PC
Status Affected:
None
Encoding:
00
0000
0000
1000
Description:
Return from subroutine. The stack is
POPed and the top of the stack (TOS)
is loaded into the program counter. This
is a two cycle instruction.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
1st Cycle
Decode
No-
Operation
No-
Operation
Pop from
the Stack
2nd Cycle
No-
Operation
No-
Operation
No-
Operation
No-
Operation
Example
RETURN
After Interrupt
PC =
TOS



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