PIC16C64-04/PQ Microchip Technology, PIC16C64-04/PQ Datasheet - Page 154

• Manufacturer Part Number: PIC16C64-04/PQ
• Description: 8-Bit CMOS Microcontrollers
• Manufacturer: Microchip Technology

PIC16C6X
RETLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
DS30234D-page 154
2nd Cycle
1st Cycle
TABLE
Return with Literal in W
[ label ]
0
k
TOS
None
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.
1
2
CALL TABLE
•
•
•
ADDWF PC
RETLW k1
RETLW k2
•
•
•
RETLW kn
Before Instruction
After Instruction
Operation
Decode
Q1
11
No-
k
(W);
255
PC
W
W
RETLW k
Operation
literal 'k'
01xx
Read
;W contains table
;offset value
;W now has table value
;W = offset
;Begin table
;
; End of table
Q2
No-
=
=
0x07
value of k8
Operation
Operation
kkkk
Q3
No-
No-
Write to W,
Operation
the Stack
Pop from
kkkk
Q4
No-
RETURN
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example
2nd Cycle
1st Cycle
Return from Subroutine
[ label ]
None
TOS
None
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.
1
2
After Interrupt
Operation
RETURN
Decode
Q1
00
No-
1997 Microchip Technology Inc.
PC
PC =
RETURN
Operation
Operation
0000
Q2
No-
No-
TOS
Operation
Operation
0000
Q3
No-
No-
Operation
the Stack
Pop from
1000
Q4
No-