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PIC18F258-E/LSQTP Datasheet(PDF) 312 Page - Microchip Technology

Part # PIC18F258-E/LSQTP
Description  28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
PDF  402 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F258-E/LSQTP Datasheet(HTML) 312 Page - Microchip Technology

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PIC18FXX8
DS41159E-page 310
© 2006 Microchip Technology Inc.
POP
Pop Top of Return Stack
Syntax:
[
label ]
POP
Operands:
None
Operation:
(TOS)
→ bit bucket
Status Affected:
None
Encoding:
0000
0000
0000
0110
Description:
The TOS value is pulled off the return
stack and is discarded. The TOS value
then becomes the previous value that
was pushed onto the return stack.
This instruction is provided to enable
the user to properly manage the return
stack to incorporate a software stack.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
POP TOS
value
No
operation
Example:
POP
GOTO
NEW
Before Instruction
TOS
=
0x0031A2
Stack (1 level down)
=
0x014332
After Instruction
TOS
=
0x014332
PC
=
NEW
PUSH
Push Top of Return Stack
Syntax:
[
label ]
PUSH
Operands:
None
Operation:
(PC + 2)
→ TOS
Status Affected:
None
Encoding:
0000
0000
0000
0101
Description:
The PC + 2 is pushed onto the top of
the return stack. The previous TOS
value is pushed down on the stack.
This instruction allows the user to
implement a software stack by
modifying TOS and then pushing it onto
the return stack.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
PUSH PC + 2
onto return
stack
No
operation
No
operation
Example:
PUSH
Before Instruction
TOS
=
0x00345A
PC
=
0x000124
After Instruction
PC
=
0x000126
TOS
=
0x000126
Stack (1 level down)
=
0x00345A



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